Did the original game have such little enemy variety before Dark Arisen? I only played the PC release where it was included.
Base DD1 had more enemies than DD2.
That's pretty obviously false.
Dark Arisen didn't add enemies to the base game. Anyone can go play DDDA and compare "enemy variety" between DD1 vs DD2. The problem here isn't the # of enemies but how they are used. Objectively, DD2 has 1~4 more enemies than DD1 (depending on if you include garbage like talos & co.), but the way the enemies are used make it feel like it has less monsters.
DD1:
Beholder (removed in dd2)
Hydra (+ variant) (removed in dd2)
Cyclops
Lich
Dragons (+ variants)
Goblins (+ variants)
Saurians (+ variants)
Undead (+variants)
Gargoyles
Chimera (+ variants)
Ogre
Harpies
Griffin
Cockatrice (removed in dd2)
Wolves
Bandits
Golem (variants removed in dd2)
Phantasms (including Specters)
Wyrms & Wyverns (removed in dd2)
DD2 removes Beholder, Cockatrice, Hydra & wyrms, and, being objective, adds Slimes, Minotaur, Medusa*, Sphinx**, Talos*** & Dulahan.
Problem is, you're fighting the same 3 enemies 99% of the game. The Medusa replaces the Hydra but it's a poor replacement - she appears once, possibly twice depending on how the first fight goes - while the Hydra shows up twice, minimum (second time being a powered up version of the first - also posts a notice on the board calling you a pussy so has more personality than the Medusa). The Hydra is a more imposing monster and the mechanics of the fight make it a lot more memorable.
The slimes are barely used.
The Minotaur is a reskinned ogre.
The Sphinx is a one-off fight (most players won't even fight it) - and there's nothing unique about it at all. It's a reskinned griffon. I guess it's supposed to replace the Cockatrice? Except the Cockatrice was actually memorable, if nothing else because of the pain it caused you with the petrification. I still remember the first time I beat it.
The Talos is a shit set piece and I included it as a monster in DD2's favor because I knew people would cry about it otherwise. Actual waste of development time, you don't even need to interact with it at all.
Dulahan is the only worthy inclusion.
DD2 having the same # of monsters as DD1 isn't a point in its favor considering the 5 years of development time btw. One has to wonder what the fuck they were doing.