plasticvet: Not gonna insist on the game being bugged, then. If anyone buys this release and plays it without crashes on Vista/W7, could he just pop in here and say that this release is actually playable? I might give it another shot.
As far as "complicated" is concerned - I remember being distinctly unhappy with the spellcasting hero system, with bazillions of semi-useless spells (don't like games where mages need to work twice as hard to get half of a warrior's job done). The unit system and gameplay itself were obviously much less challenging - getting a muscular Hackmaster as a leader and chucking out a vast screaming horde works just fine.
Really, what put me off most were the incessant crashes.
Vista x64 - works nicely. Not crash free, but nowhere near incessant. For me with a GOG I consider a crash every 5 or so hours of play to be fair game. This easily met that.
Spellcasting is a little bit rough around the edges, certainly if you tried for one of the battlemage style things like fire. Remember that the pause is just about active, so you can pause, select spell, cast, run (I think you may have to release pause to run away as otherwise you'll cancel your cast order).
Mage variants I found worked well were a night elf fighter with healing magic, or a demon summoner (haven't tried this on WBC 3, but on 2 you could summon succubis, who then left souls of their victims, that allowed you to restore your mana, and summon more.
I found the fighter classes much more playable, and I'm normally a mage heavy player.