I agree with the vast majority of this, but there were two in my mind that looked pretty off to me when I saw them:
Balrog in LOTR. Maybe I'm just being picky, but I never found him to be impressive at all. I found golumn to be a much more impressive feat given how much you see him and how quickly you forget he's all digital.
Two Face in The Dark Knight. I would have preferred some well done make-up to this digital stuff. Maybe it wasn't so much the effect as it was the acting that took away from the effect. Try and talk with half your lips/mouth missing, either by trying to keep them open or holding them open. You sound noticeably different (at least I do) but in the movie he talks like nothings missing... possibly because they didn't do anything to his mouth and it was all digital. I may be wrong and he just got comfortable enough to talk well, but I don't think that's it.
Both nit-picky I know, just something I wanted to mention.