Kill Bill was appallingly awful. That said, I didn't expect it to be great. I saw KB 2 on DVD and watched perhaps 20 minutes. If Tarantino had edited the two films together he might (just maybe) have made a good film, but for me, it's easily the worst thing he's done. Yes, even including Death Proof
Possibly a bigger disappointment was Shrek 3. I had premiere tickets through a work contact, took the kids, who gave a resounding thumbs-down. They'd been so excited after the first two instalments, but the third was astonishingly poor.
On the flip side, just watched Iron Man on DVD, and expected it to be utter bobbins. For what it was, the result was surprisingly well-scripted and acted.