Opinions and points of view vary greatly from this game and what I've seen a lot is people that were never into action games (or Devil May Cry before) loving DmC.
I've played them all and this game is awesome. With that said, Vergil's Downfall is so mediocre. Not worth 9 bucks at all. Hated the comic book style storytelling. It felt cheap compared to the main game and Vergil controls like ass for the first couple of missions till you unlock his better stuff. Not recommended from me at all.