the way i see it they had some of the game done but then capcom cut there dev timeI've never bothered to find a legit source for this, but the game was supposedly only 40% complete due to time constraints and Capcom wanting to rush out with an action game on next-gen consoles before the competition, if you're willing to believe that.
It does sound like some BS that a dev would say when fans aren't happy with a product but, looking at certain aspects of the game, I truly believe it was severely incomplete. For instance, it's incredibly strange that Dante has twice (or or less, it's been a while for me) as many moves and many more weapons than Nero, but only half as many missions.
That doesn't make the game any better, of course, but I don't think it should be seen as a shortcoming on the developers part.
so they used the time they had to polish the game play as much as possible
at least that what i think happend