Played this for a while. Well, I've played it everyday since I've read this topic. Man, this mod really deserves more attention and luvs.
Firstly, this is not just a BLOOD AND GORE mod. It does WAY more than that. Sure, the massive amount of gibbing and gore may give you the initiate "dis iz a lulz mod" impression, in reality the amount of gore is actually quite realistic, which means you will see stuff like individual body parts flying away, very good headshots, and just in general way realistic death compared to games even like Soldier of Fortune (games with good gibbing like SoF still suffer from the fact that there's so little blood even if you quartered someone). The fatality is also just a feature that you can use for fun, and in fact I find it not very practical because melee in Brutal Doom is almost suicide.
What really makes the mod shines is how BRUTAL its gameplay style is. All the weapons are very nicely balanced - rifle (the one which replaced the peashooter) is very, very powerful and fun to use (headshotting Hell Knights to death with iron sight is insanely fun!!), the original shotgun spread much less and become way more powerful at any range. Combined with spectacular headshots, just using these two alone will give you some very, very good..."shooty" feeling. I don't how to explain it, but shooting in Brutal Doom really gives me a "punch" feeling...anyway it is good!
On the other hand, difficulty got upped by almost 100% and will make even the most hardcore Ultra Violence Plutonia Experiment player a run for it (I've never had the guts to play Nightmare). Shotgun Seargents are LETHAL because shotguns hit harder and the AI of them are MUCH better at aiming, so in any room with these guys, you can no more leisure around picking stuff around a room and take pot shots at them. You MUST kill them fast (preferably with headshots) while carefully take covers. In fact, it IS a popamole gameplay style - but popamole done RIGHT. If you pop out of the cover, then kill stuff slower even for a split second, you'll be mercilessly splat in your face with massive damage.
All the hell monsters are fucking scary now. Imps are no more pushovers, their fireballs are FAST, and they can fucking jump on you. Specters are much harder to spot, Barons of Hell have a very cool acid spread attack, Spider Mastermind fires fucking exploding shells (imagine its chaingun shooting depleted uranium shells), and it and Cybie and Pain Elementals all will gloriously explode when they die. I find the game fucking hard to play even on Hurt Me Plenty, and every encounter feels very lethal and challenging.
Last but not the least, the new animation and sprites of the game look very, very well done. One main thing that makes me don't like playing mods that introduce new graphics is due to the fact most of the new graphics look way out of place compared to the vanilla stuff. It's even worse for most Doom mods because I find sprites to be even harder to make it feel "right" than 3d models. But Brutal Doom really blew me away in this part. Most of the new sprites look very nicely drawn and definetly in the same spirit like original doom. In fact, I think if someone has never played the original doom, he won't differ what sprites are new and which aren't. The majority of the monsters have at least three different kind of death animation, that's not even including the fatalities. Zombies for example, have at least normal death, normal gibbing, headshot death, leg-blew-away-then-crawling death, arm-blew-away-then-bleeding death, Fallout style chaingun dismemberment death (in itself you'll have blow arm away, blow head away, and blow body away animation), plasma gibbing, rocket gibbing, and maybe a couple more. And all the new weapon sprites are very well done too (I especially like the details, like you'll leave an empty clip after reloading your rifle, and your chaingun will spit out empty cases all over the place).
Really, this mod is good. Very good. There are a few bugs here and there, but the author is actively fixing it (the last update fixed the Archviles so they won't do only 20 damage now). He's even willing to change whole animation that feels weird or wrong (the last Mancubus fatality is very badly drawn so he scrapped it and replaced with a new one). The game is fucking hardcore though, it's hard to survive even for the first 5 levels. If you have been popamoled in this few years of gaming, you'd better not try this.