According to All Music Guide his worst album is "Gone Troppo". It received 1 of 5 stars! (afraid4). Is really that bad?
I just listened to it today, for the first time in a long time. I don't think it's bad, it's just average. All the songs share the same mellow mood, with lots of harmonized slide guitars, but there's nothing really remarkable about any of them.
The only exceptions would be "Wake Up My Love', since that's the song with the most synths, and "Circles", which has a "bluesy" (for lack of a better word) feel to it.