While I'm not a terribly huge fan of HTTT, going back and listening to it, as a sound it sounds fantastic. The biggest problem I have with it is it doesn't feel very polished. Some of the songs sound either like b-side material or like they didn't go far enough to get them right. Other songs sounded much better on the short tour leading up to the album (I weep for what We Suck Young Blood could have been. You know that part where it goes crazy and then suddenly stops? Imagine if it didn't). I just wish they had spent more time with it getting it right.
That said, it's still a Radiohead album, so who am I to complain.