TheCheese33: Okay, I should elaborate. The reason I'm chiming in is because the one comment I constantly hear is "The old ones were the best, but the new ones suck!" I kind of like Sonic 2, but other than that, when people point to "Sonic Adventure" as the pinnacle of the series, I don't think they know what they're really saying. It's like they haven't played it in forever, and it was the first game for the much beloved martyr console, the Dreamcast.
I actually appreciate that Sonic Team tried to fix the formula. Even when Sonic 4 released, people weren't happy about it, and that was supposed to be the throwback one. So I think much of Sonic love only comes from nostalgia.
What was it, exactly, that people didn't like about Sonic 4? Was it because it was episodic? Was it because it didn't have the classic 16 and 8-bit sprites and backgrounds? To these complaints I say A) The "episodic" nature began when Sonic Team had to split up Sonic 3 and Sonic & Knuckles, and B) Classic sprites and backgrounds aren't really a big selling point, except for a "leading minority" of players. Look at Mega Man 9 and 10, and tell me that they sold solely on the basis of 8-bit graphics and chiptunes.
I'm also not sure I agree with the description of the Dreamcast as a "martyr" console. Mostly because I can't see a machine dying for it's beliefs or faith, as is the definition of "martyr", but also because part of the reason of it's failure lay with Sega's poor marketing of the thing. It's true for all of their consoles. To this day, I have no idea what "blast processing" is, and I can't remember one really outstanding Saturn advert. Many good machines have fallen prey to bad advertising and even worse management (look up Mehdi Ali and Irving Gould), though the community "fanbase" of those machines would just as quickly, and often erroneously, attribute the fall of said machines to conspiracy from larger competitors (Microsoft killed the Amiga, etc..).
That was long-winded and largely off-topic, but I just wanted to put a couple things in perspective for both the proponents and opponents of the Dreamcast.