Was it Sonic's transition to 3D that killed the franchise? No. It was the jump to third-party that killed the little blue guy.
Look at the reviews of Sonic Adventure:
http://www.gamerankings.com/htmlpages2/198694.asp?q=sonic%20adventure
Look at the reviews of Sonic Adventure 2:
http://www.metacritic.com/games/platforms/drm/sonicadventure2?q=sonic%20adventure%202
Universally, Sonic Adventure, and Sonic Adventure 2, are outstanding games, with very high reviews, all over the world! I do not care if you don't like them, for that would be only your opinion. They are both very good games, and both have recieved higher reviews than "any" other Sonic game after it! Both 3D, and 2D. That alone, is proof, that Sonic did not die in the transition to 3D, but because of his multi-platform leap!
If you were to ask anyone what their favorite Sonic game is, many would say "Sonic Adventure 2." It is not uncommon. Lots would also say "Sonic Adventure." Sure, more would say, "Sonic the Hedgehog," "Sonic the Hedgehog 2," "Sonic the Hedgehog 3," and "Sonic CD," but almost no one would mention any other Sonic game. It gets very annoying when people keep on blaming the fall of the franchise because of the blue blur's transition to 3D. If you actually played the Dreamcast games, and got "good" at them, then you would appreciate them more. Are they perfect? No.
There are many things that I do not about the Sonic games for the Dreamcast, but then again, there are many things I don't like in any video game. They could have stayed truer to the series. Ever since Sonic's revision of appearance, he just wasn't really Sonic anymore. He was new, and cool, but he was not the retro Sonic we all grew up with on the Genesis. However, he got far worse after the Dreamcast. I don't even really like his new 2D games. Too bland, boring, and repetitive. They're fine. They are better than the 3D Sonic games after the Dreamcast, but the Dreamcast Sonic games own every other Sonic game after it.







