I, for one, revel in Ninja Theory's failure. I do not care if DmC: Devil May Cry was a good game, but I don't think that Ninja Theory deserves to be successful with this game.
Devil May Cry isn't Resident Evil, it is nearly as mainstream. It is a series driven and supported by its devoted fanbase. To be given a franchise like this, and proceed to tell the fans of said franchise that your vision for the character is superior, and theirs is outdated ('Trust us, we know what you want') is ... well, I don't agree with it.
Here's the comparison I used. When MGR: Revengeance was announced, many people bemoaned the change in direction. 'Where's the stealth', 'It's a generic action game now', 'This isn't Metal Gear Solid'. Platinum Games could have responded by saying "Hey, stealth isn't what we do and it's boring. Look, what we are doing is going to be better than what you have seen from the franchise previously". What did they infact do? "Look, here's some gameplay showing elements of stealth", "The cardboard box is still here". They tried something new but still revered the original franchise; DmC spat in the face of the series and boasted itself as superior. "Lol, Dante would be laughed out of a bar", "Nah, you don't need 60fps", "Our story is going to redefine the possibilities of the genre"
I hope Capcom look at this and assess what they should do in the future. In attempting to reach the mainstream audience, they have ignored their true fans. That mainstream audience, however, will just as easily go for Ninja Gaiden of MGR: Revengeance. Making a great game for their fans, and expanding their fanbase, should be their priority.