I don't think DMC2 was that bad at all, but it cant compare itself to another dmc in the series, because they are just too superior, but even though DMC2 gave some advances in the saga. Which Are:
-BLOODY PALACE: that would have been more intereesting in DMC2 if you had more combos, but they weren't, so its come back in 3 and 4 are cool. But the idea came from this game.
-SELECTING MISSIONS: well another advance that started in this game and spread as a common charateristic for the other future games.
-COOL DTS: yes, dmc2 is a weak game, but i don't think i am the only one who sees both DDT and normal DD as the greastes demonic transformations in the saga.
-SOURCE FOR MORE DEEP STORY: capcom could be more intelligent, and start a sequel to DMC2 and end the evil chain reaction of prequels, and have a NORMAL dante, starting in hell, and a whole new story with nero around in the human world, and even VERGIl could take place in the game. I know everybody would love this.
But to the point, making a remake is useless, and DMC2 at least offered something to the series.