Really, really not as good as everyone makes them out to be.
They're also a bit noveltyish, I think.
Moreover, they shouldn't ever be spoken about in the same breath as the Stones or The Beatles, because there's such a universe in between them regarding quality and consistency. This is probably proved by the fact that I bet you a million quid that they played 'You Really Got Me' at Every Single Gig, even when they stopped being all beat and rocknroll.
I don't think they're crap by any means, and I do love his voice, but of the selection of songs I have heard, The Small Faces are Arsenal and The Kinks are Fulham.