Its like Ultima + Something Else (Don't really know what the something else is since the only oldschool PC game I've romped through is Ultima). I love the complete lack of hand holding when it comes to where and when you can go somewhere (lots o' dieing).
I made a complete Rogue character specializing in Traps, Locks, Hiding and Sneaking. Oh and even the vials in this game have an Ultima'esque look to it or maybe all video game vials look like that.