I got enjoyment out of all of them (even 06 at some points), so I really can't call any of them bad, but if I had to pick the ones that I liked the least, It would have to be the Storybook games because of their on-rails gameplay. I would say that Secret Rings is a bit worse than Black Knight though, can be so frustrating because of the controls.
And while I am at it, my favourite ones are Generations and Adventure, in that order. I did not start playing Sonic until 2011, so my liking of both is not nostalgia based. Adventure 2 was great as well, but imho noticably worse than Adventure 1. There you have my two cents.
Oh, and since it's recent: I really like Lost World, too. Might become my favourite one if you don't count Generations/Adventure.
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