I like the idea of this thread being a resource for players that enjoy ironman play style, so here are some comments / recommendations on games I've ironmanned in the last six months:
Wizardry 6: Rating 4/5
For a game with a reputation of extreme difficulty, Wizardry 6 was surprisingly easy to ironman and a lot of fun. One of my favorite things about ironman play is that it forces you to learn the actual game mechanics and how to be good at them, and I love that Wizardry 6 is actually easily beatable without any party wipes if one plays carefully. My strategy was two fast bards to get through the early game, and then later game lots of fast casters to disable or kill enemies before they could move. Toughest parts of the game were the dwarven mines, the river styx, and the temple of ramm. Took three tries.
I probably wouldn't recommend ironmanning it blind though.
Wizardry 7 (Import from Wiz 6): TBD
I haven't made much progress on this one. I'm basically too scared of losing my imported party, and I've noticed its much harder to reliably kill or disable enemies before they can move. Probably still doable with careful play, but I'm both a little tired of wizardry gameplay and too scared of losing my party so this one has been shelved. I am confident that it is much harder to ironman than wizardry 6 though.
X-Com 2 (Commander / Legend): Rating: 4.5/5
It's great, everyone knows it's great, enough said. I have no unique viewpoints here as tons of people have played X-com 2 ironman.
Pillars of Eternity (WM1 + WM2 | Tripple Crown): Rating 5/5
Superb ironman game. Also playable blind, which is a further credit to the developers. I did lose a run 40 hours in to the Alpine Dragon, in part because I did not realize he had rogue abilities (e.g. death blow) and he dropped a 300 damage crit on my PC, killing him. Ouch. My fault though for not playing more carefully; it was an entirely winnable encounter. I will probably try solo tripple crown at some point (which the "ultimate" achievement playthrough where you have to kill all the dragons and archmages).
Not much unique to say here though as there are tons of people playing ironman PoE.
Deus Ex (Realistic): Rating 4/5
Surprisingly good ironman game! I'm surprised that basically no one else has tried this (at least judging by internet searches). It's tough because a single pistol shot to the head or torso will kill JC on realistic when he has no armor. So basically, if anyone with a pistol shoots at you at any time and you are not armored, you might die even if they are very far away. But there is a ballistic armor aug not that far into the game (~5 hours of play) and it is entirely possible to reliably get to it without getting killed. The best mechanics of Deus Ex, i.e. the stealth, the careful play, smart augment use, etc. are all significantly heightened by playing ironman, so it's in my opinion a very good ironman game. My best run got to the Secret MJ12 facility and then I got killed because I left my augs on during the cut scene and therefore woke up drained (and then messed up the first encounter with the guard outside your cell; I didn't think he would come search your room). Anyhow, I'm pretty sure that if one gets through that MJ12 part, the game is pretty manageable as if you save all the aug upgrades, by that point in the game you level 4 balistic protection aug and can even survive a shot with a rifle.
Anyhow, I'll get back to this at some point. I actually dislike the plot to Deus Ex a lot (too much "teh corporations" crap) so I haven't put too much time into it but the gameplay is great.
BG1 (SCS Mod): Rating 4.5/5
Not much to say here that isn't said better in the Bioware forums' no-reload thread. Great game, made better by playing ironman. I used a PC berserker, which I think is easily the easiest ironman PC class in BG1, with a party of Jaheira, Khalid, Viconia, Edwin, Imoen. I actually ironmanned it twice in a row because the first party almost immediately died after escaping Jon's dungeon in BG2. The final fight is hard with SCS, and I both times wound up cheesing it with a lot of PC kiting (fucking hasted Sarevok is a real menace if your install doesn't have dispelling arrows). In the final fight on the second winning run, that fucker Khalid panicked while he had detonating arrows equipped and killed both himself and another party member when he panick-berserked. God what an asshole. Still a great archer up until that point.
I was too much of a wimp to do the TotSC content, which doesn't provide any value to a party that is going to import into BG2 and so I just skipped it.
BG2 SoA (SCS Mod, Imported Party): Rating: 5/5
As with BG1, just read the Bioware forums' no-reload thread if you are interested in information here. BG2 is one of if not the best CRPGs ever, SCS makes it even better, and ironmanning it makes it even better than that! Party was PC Berserker->Mage, Jaheira, Haerdalis, Imoen, Viccy, Edwin. I think that is the cheesiest and strongest party for ironman play, but I'm sure lots of combos work. I put far too many hours into BG2 because it was my first attempt at ironmanning an RPG and it's a pretty difficult one at that.
Some tough fights are: shade lord, planar prison, Irenicus in Hell, anything with beholders if you aren't extremely careful, that shitty nether scroll lich that you (I think) have to fight early for Edwin and seems to always summon a fucking balor before you have SI:A and is just generally a total asshole, both underdark liches depending on what they cast, that pack of vampires in Firkraag's dungeon, Irenicus in spellhold depending on what he casts and what the insane mages do, Bodhi with the lantern (holy fuck bloodsuck), trademeet rakshasas depending on when you fight them, planar sphere if not going it in chapter 6, maybe some others.
Kings Bounty the Legend: Rating 2/5
This worked OK as an ironman game, but didn't really improve much on the core game mechanics. I think it's definitely more interesting than the "no casualties" runs people do, but overall Kings Bounty the Legend is a game that gets progressively more boring as you get farther into it and ironman unfortunately didn't really help that. I quit somewhere on the dwarf island out of boredom. The hardest part is that certain fights do not show difficulty (as wandering stacks do), so if playing blind or semi-blind it is easy to get oneself in a totally, totally impossible battle that ends the run. That fucking kid in the evil swamp castle on one of the early islands did that for me.
Honestly ironmanning in some ways just makes KBtL worse, because you can't upgrade any of your items safely (easy to spawn a totally impossible gremlin battle) and you can't fight castles safely (similar problem), etc.
IWD2 (Insane): Rating 3.5/5
Plays well ironman, but the AI isn't smart enough to make it a really interesting challenge as with the baldur's gates with SCS. Playing on Insane makes it more interesting, but I would recommend to enable cheats to allow yourself to teleport while out of combat. Otherwise I would say 1/5 because fuck all that trecking back and forth to healers in the beginning. Insane mode gives pretty ludicrous accuracy and damage bonuses to enemies, so its very easy to get individual characters killed and need to go visit a cleric. I think too easy without insane mode though - building a strong party is just too effective. I played with a cheesy party of all drow (spell resistance is just too good). Two tanks (bard, AC-focused cleric) and a druid, wizard and two sorcerers. I don't think I had any party wipes, but maybe I'm forgetting.