Roqua, nice try to convince us casters are useless. You're 30 years late!
Also a way to improve your team would be bringing a buffer like a Cleric and bolstering your warriors. That class you despise has the spell "Haste" that can turn the tide of the battle and can be extended to the whole party.
I wouldn't waste your time with Roqua on the topic of IWD, he hasn't even played it. He has a script of nonsense he spews about the IE games and doesn't require experience of the games to relentlessly bang his drum.
In case no-one's noticed, practically all RPGs can be munchkined once one is in full knowledge of the game's whatnots and howyoudos. If someone's already very experienced with D&D then games that involve D&D will be easier for them first time out more so than someone who has never even heard of a Thac0 nor how many legs it has. IWD is suitably hard for people who are fresh to it, a fun challenge for experienced RPGers and fully munchkinable for those that enjoy steamrolling.
When I tried to explain to Roqua about how the whole point of IWD is that you can make the game as hard or difficult as you like via it's extensive options at the start of the game he replied that he doesn't care about all that, he was just basing his judgement on how the game was meant to be played on standard settings which, for most games, might the right mindset to take but for IWD that's like saying "I've defeated Minecraft because I've dug a mine and built a house, and it was well easy", because IWD is pretty much just a module which you can do shit with rather than simply a game in and of itself.
The big set pieces will always have complications and the henchmen are usually manageable whatever you do. If you buy all the AC gear off of Pomab at the start then fighters can trivialise a lot of early encounters. Picking sleep for a mage can trivialise a lot of early encounters. Having everyone use bows can trivialise early encounters. Haste can trivialise encounters from the half-way pointish, as can the Cleric's heal spells. If you save scum for the rings with your rogue's/Bard's pickpocket skill this can give you great advantages. The Sorcerer can totally abuse improved invisibility. And all this is before you even start debating dual and multi-classing.
But the majority of people wont be playing like this the first time out. They wont be sure that they have enough money to buy the AC equipment, they wont pick sleep but instead something with a more exciting name, they'll vary their team, they wont be bothered to keep resting to haste everything (quality of life), same with the Cleric's heals, they wont know who to pickpocket and why, they might not even pick improved invisibility and hardly any will dual or multi-class. So when Roqua says "play it as it was meant to be played", it's a different "as it was meant to be played" than most will experience - because he's set his stall and is more interested in holding a verbal position than actually being objective, something which has inevitably exposed him to all the munchkins over the years even before he sets off for the first time.
When the HoW expansion was released there was even more munchkin stuff available via Bard songs and Druid's spells, let alone whatever new classes Beamdog brought to the show.
For me, how I play IWD is purely Quality of Life. I watched a Sensuki let's play of IWD when Sensuki was doing the whole PoE stuff and I don't play anything like him, he just zoomed his characters around, all melee unless it was a harder battle, health dropping to nearly dead as each battle hacked away a few more drops of red, then one dies and he just reloads a save and rests them before continuing. Now, to me, that's just a really ugly way to play. I like to have each character play their role, do a bit of positioning for each encounter and try to pass each encounter with zero lost HP. I barely ever rest in IWD, to which barely ever means only when I return to Kuldahar and deposit my loot in my loot chest in the hotel room I can rent for free because I solved the Inn quest. I only use Haste for the big set-pieces, usually at the end of a long crawl which would give me a full backpack anyway. I am at the point where I can easily steamroll the game if I want to, but the carte-blanche copy-paste criticisms are usually something I never encounter nor recommend. 'Playing properly' provides a very enjoyable experience that doesn't even involve hardly any pathfinding issues... I'll do a vid sometime.