I think this guy is pretty good. I love his songs "Roll With It" and "Don't You Know What The Night Can Do?" I also like the stuff he did when he was in Blind Faith (that group he was in with Eric Clapton)
To be fair: the original post was a statement of opinion, and not really an impetus for discussion, but at least we've been given a little bit of background apart from a favorite album.
And by the way, TRAFFIC FTW
Most everything Winwood's done since Traffic has been more or less irrelevant aside from Blind Faith. IMO.