Your not, the game is fun, colorful, and the music is kickass.
Despite all the times I've tried to get into it I really just don't like Sonic Spinball. As a kid I always found it a confusing, frustrating, but ultimately boring game and that hasn't changed over the years. I played through a ton of 3D blast with the same feel, I gave up because it became a boring and confusing mess.
I haven't played a post Sonic Adventure outside of COLORS and even Sonic Adventure didn't impress me very much. It was an ok game but nothing I can get nostalgic over since I didn't own a Dreamcast back when it was new.
I am pretty surprised that the OP didn't list the Sonic Rush series. I hear hardcore Sonic fans bash those games all day long. I actually found them to be pretty fun and a rare positive change to the Sonic formula.