
Supergroups whose whole never came close to the sum of their parts?
I love RATM and Soundgarden, but Audioslave took one of the best rock singers of all time, paired him with instrumentalists who could craft a riff and a groovy beat as well as anyone, and made... some of the most generic radio rock music ever. This band's best music has a hard time coming close to the worst from either RATM or SG.
Any other examples of this?