It seems (to me ) that many of the enemies (mainlyy the Hive) don't really fit what they are.
Hive acolytes are bulky and don't look like the progression of Thralls. Knights are alright I guess but the Hive don't look like decaying beings driven by blood lust. Wizards just look derpy to me now. None of them have the usual Hive aesthetics like nails in their arms or bony limbs. They are too healthy looking. The Ogres look awesome though.
The Vex look a bit more cartoony to me, especially the Goblins. Their heads are huge now.
The Fallen look great imho. They have more detail added and I have no complaints about the Cabal.
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There is the cabal legionary that looks like guinea pigs to me