You were comparing the game to diablo so I'll use your comparison. When I played Diablo, I thought that the game has only two monsters: skeletons and burning skeletons. Ah, and some bosses. Diablo 2 had those annoying little red munchkins. Bad comparison again.
Er, sorry Death, I'll have to correct you on this since you seem to have no clue what you're on about.
Diablo 1 had about 10 diferent monsters. The fallen, goatmen, skeletons, zombies, those annoying-as-hell shadow monsters, teleporting magi, succibi, hell knights, demons and lets not forget the wonderful acid-spitting dogs of doom!
D2: Even in act 1 there are the fallen (muchkins) goatmen, (again) corrupted rogues, big hairy yeti mothers, floating vampire monsters and the wonderful lightning-spitting demons. To name but a few. My favourate act, apart from Andariel. (biatch)
IMO the battlefields are dull, I've seen a max of 3-4 different types of monster in each one (act 1 and 2 BF's so far) and the dungeons are a tad large. Fun for a while though. Good relief from the game. Also you end up not really giving a sh*t if you do the quests or not. Can be a good or bad thing.
Final point. In the Act 2 BF's, first dungeon there was no boss monster there?? <img src="/ubbthreads/images/graemlins/confused.gif" alt="" />
Seemed odd to me.
