Yeah, one of the few good things about DMC4 was the gameplay, even if Nero is rather boring. I found it a disappointment that he just stuck with the sword and gun instead of having multiple weapons to choose from - yes, he got Yamato later, but that's just another sword. That said though, the swordplay was quite nice, and that video shows how nice it can be.
A DMC4 multiplayer, you say? Well, only if it had multiple characters to choose from. And not just Dante, I would like Trish, Lady, Vergil and even Lucia as playable as well. That would be a dream come true.