I'm a huge Sonic fan myself, so I've played or watched most of the media on the list, with exception of Sonic '06.

Really, the only thing I consider absolutely horrible is Sonic Labyrinth. Every thing else has at least some redeeming qualities.

I owned Sonic Labyrinth briefly years ago. I had asked for Sonic Blast (Game Gear) for Christmas, but my mom couldn't find it at EB Games. So she decided to get me this game instead. I tried playing it on Christmas Eve, but gave up within a half hour. Fortunately, at that time EB Games still had the policy where you could return a game if you didn't like it, no questions asked. So I returned that piece of crap, and eventually found a copy of Sonic Blast.