Problems of DMC4 aren't because people got fed up with the style. Actually, in some ways it's the opposite with how they did change it with Nero and all. That and the progression of the game was really dumb. GoW3 is probably going to be more like Halo 3 in that it's a well regarded sequel that doesn't deviate from the original formula.
And 2009 for action games should still be great with MadWorld, Bayonetta, and GoW3 (unless they still have a lot to work on, which wouldn't be surprising because it did look early)