Nero sucked, and only DMC 1 and 3 are any good, really. I think they went too far with this. If they'd been smart, they would have handed Ninja Theory an order to remake DMC3, rebrand it as "DmC," then have DMC1 remade to be "DmC2." Update the graphics, level design, dialogue, etc., but leave the core elements untouched as much as possible (characters, combat).
Jack Thompson is so disbarred, he's not even allowed to practice the law of gravity. - Kotomo
Vergil is Nero's father. He fathered him at like 12. Potentially with a prostitute.
I didn't hate DMC 4, it was fun. But as far as plot presentation and thematic elements go; it was in a downward kind of way, I wouldn't go so far as to say it was NEEDED, but I'm a little glad. I don't think the gameplay needed the overhaul it got, but as for as the plot goes; it was headed nowhere I like.
(Note: I don't hate Nero, just the walking plot hole he is... well I guess that's no longer quite true.)