While a lot of people are kind of down on the Sins in DMC3, I appreciated their consistent theming and visual design. Their movesets, too, were in line with the sin they represented. And similarly, the chess pieces were interesting in concept, even if their execution fell a little flat. I do understand the criticism tossed their way, though.
Some of NG2's enemies were really really awful. The giant fiends looked cartoonish and gangly. The werewolves were really uninspired and non-threatening looking. They chucked an infinite supply of severed limbs at you. In the swamps, there were cyclops zombies with a cannon for one arm and a chainsaw for the other. It looked like a 6th grader's doodle during math class.
For the bosses, you have a member of the Spider Ninja clan who is literally a giant spider. There were nuclear armadillos. There was one giant tunnel worm. There was a possessed flying subway train fish thing.
NG1 had some great designs, but NG2's were an unfocused and questionable mess to me.
And as a sidenote, I'm definitely not trying to turn this into a DMC vs NG anything. I celebrate both series, and I usually try to stave off that negativity if possible. It would benefit us all for both series to return to form.