I agree with Brad; how could the author forget to mention (or possibly not know about?) the Traveling Wilburys? Anyway, as far as I'm concerned this 'supergroup' is made up of talented musicians who play a genre of rock that thankfully died with the '80s. Not being relevant isn't a problem if the music works on an artistic level, which it does not. Check this review of their album written by someone at AllMusicGuide.com:
They gave the record 2 stars and I personally think that's about right. I found it to be a major labor listening to their record. It just doesn't work. Hagar is a good singer but honestly Van Hagar material doesn't even come close to the stuff with David Lee Roth (regarding the Van Halen comments above). Roth was a much better performer and singer, in my opinion. I'm glad I got to see the band reunite a couple years ago (minus Anthony, unfortunately) and it was one of the best shows I'd ever seen! They played nothing but material from the first album through 1984 (which I had hoped for) for three hours and it was amazing!
Anyway, yeah... Chickenfoot - great musicians, sub-par music.