And remember the basic rules of D&D dungeon hack.
Fire+troll down=roast
Have a thief in the front spotting for traps.
Golems need to be crushed with blunt weapons.
Anything partly dead fears your paladin/cleric. Use turn undead.
Use spells which bind foes to their place like Web and then kill them where they stand from afar with spells and ranged weapons.
Case walls with your mouse for secrets.
Remember that different buffs stack; early on you can make perfect tanks with a few measly wizard spells.
When encountering mages, try to hit or shoot them while theyre casting, the spell usually fails. The same applies to your magic-users, however.