Game is easy for a DW Warrior. I did it with maxing out DW(13), Regenerate(11), Life Leech(10 or so), Lockpick(5) and Whirlwind(6). Game was a breeze(on medium). Stats went into Vitality/Strength, at a 40/60 ratio. Only trouble I had was Ministry, where you have to protect Zandalor. Put some skill points into summon demon and that was easy too.
Never needed potions later in the game, cept last fight.
Raze was easy too, you just pin him to the wall. There are some convenient little corners in that room. If you don't succeed in that, fight him till he turns around, then make sure you flip the switch before he can regenerate. It's not hard, just takes some timing. I shrugged off his summoned thingies, they couldn't hurt me anyways, and standing near me, they only blocked his way, which was good for me.
Personally, I think it'd be easier still for Twohander Warriors. Always strikes me as more powerful as DW. But I just prefer DW. Only annoying thing for me was Rangers. Kept stunning me and running away. Really annoying.
Also, don't make great weapons quest items, guys. Barbabus' mace was the best weapon I found. Turned in his quest and found myself without a main hander. Had to buy one.
Was a little disappointed in weapons. Lack of good 1h swords. And Intelligence requirements? On swords? I had one legendary sword, gave a bonus to spirit and intelligence, and I never used spirit or intelligence. :-/ All the armor sets (which were great btw, wish there'd been more) had 2handers as a weapon, no 1handers.