I didn't like the missions at all. I didn't like the fact that I had to find stuff or destroy a certain amount of objects just to complete the stage. The game would have been a lot better if Team Chaotix wasn't in it.
To be honest, I didn't know those guys existed until I played Sonic Heroes. I found out that they were also on that Knuckles Chaotix game, but I don't think it was successful.