Just take a look at the track listing. He's one of the most proliferous "Rock" artists that I know of, outside of his band. His vocals are always impeccable, and he always gives it his all, he never phones it in. A true craftsman. For the most part, this is his "Duets" album, although it's missing that awesome "Summer Wine" track with the Corrs. But, that's for another time.
If you like U2 and you like Bono, then enjoy this collection. If not, then, what can I say, get stuffed.