My beef with bad reviews is the insistance that a Sonic 4 must surpass Sonic 3 and Knuckles.
Look, I WOULD love a game that blew S3&K out of the water, but I am a realist. Sonic Team as it was in the Genesis days is long gone. The team has changed so much that they don't have the same people and goals that the franchise had in the mid 90's. Not to mention that the landscape has changed for games. In the mid 90's 2D Sonic was a AAA top tier type of game. Now, in 2012, 2D platformers are retro throwbacks (rightfully) relegated to digital download services. There HAVE been exceptions: Mario has 2D disc releases, but they are mainly retro rehashes intended to appeal to older fans who remember the old days. Not to mention, Nintendo has the money to spend on these types of games and Mario will sell even if it's a spin-off involving player dressing Mario with the Wiimote.
Rayman is another exception, but (and this is what I had thought I heard) Origins was not a sales success. The thing dropped in price within a few months. I got it for $25 when it was initially, what, like $50?
So what I'm getting at is that (1) a fully 2D Sonic game will never be a AAA disc release as it is both a gamble for SEGA and, I think, not the company's goal for the character. Sonic is first a 3D game (Colors, Unleashed, Generations), second a spin-off character (M&S, ASR, Riders) and thirdly a 2D game (portable, digital download). Also (2) Sonic Team does not have the same ideals for the franchise as they did in the 90's and they do not have the same talent. They CAN made a fun 2D game (Generations 2D sections, Episode II) but they cannot make something that will beat the classics unless they put a LOT of effort and money behind it, which as I mentioned is not the goal of the series.
So basically, I'm happy with what they can give. I liked Ep II and I hope we see an Ep III. I don't care if it isn't a Sonic 3 killer or what we dreamed Sonic 4 would be back in the mid-90's. I just want 2D Sonic with the classic stage progression on my home console. I'm glad 2D Sonic broke out of the portable handheld world.