Funny, I was just watching his videos yesterday (Serg's, that is). I actually kind of liked his Chopin Scherzo, but I didn't watch it ALL the way through, and that Bach concerto movement wasn't at all bad...but some of the newer clips, with him in that fancy-looking hall, were quite dry, especially the Pictures at an Exhibition, and he had an almost bored look on his face and made careless motions at the keyboard, giving me the impression that he wasn't trying his best because certain parts were very easy, and especially when compared to the rest of his repertoire. His Moszkowski and Czerny etudes were horribly dry, I thought, and lacked little originality.
For what he is, though, I don't think he's really that bad. That is to say, he isn't exactly touring the world like a Horowitzian virtuoso or getting himself a bunch of publicity; I'd say he's about as well known as he deserves to be.