Okay, I'll bite:
I didn't particularly like his remix of Marillion's 'Brave' or his 'Tales From Topographic Oceans' (Yes) remix. And his efforts on 'A' (Jethro Tull) were not as rewarding to me as some of the other Jethro Tull remixes. So, yeah, some are not so good in my ears. But like I said: it is a matter of taste and all very very subjective.
edit:
Oh, and his 2 ELP remixes are far from stellar. Rumors of outside interference (by Greg or Carl) or very much speculative: I take it on face value and judge those mixes by what I hear and conclude that I don't particularly like his Tarkus remix end his ELP (self titled) remix either.