It seems to me that anytime the Hulk was out in brght sunshine, the CGI seemed to be not as realistic as when he was kept in relatively low light. The tank fight scene was just horrible, but all shots of the Hulk (in the lab, in Banner's home, etc) were pretty good.
BTW, After having watched TLOEG just the other day, I thought, why not have a simultaneous use of suit, puppetry, forced perspective, and CGI.
Hyde didn't look bad at all if you overlooked his hands, which just sat there. If they could have been rendered in CGI, or puppetry to actually make them interact with the enviroment, it would have been much better.
I just don't think CGI is gonna work for this, as you are forced to have both actors and CGI interacting with the same enviroment, and I have yet to see that rendered well in any movie.....
therefore....
I will always want a man in suit/cgi/puppetry combo.
Alright, I know I am going to get flamed for it, so save those responses that are strictly negative, and give me some actual ideas/facts/examples if you think wholly CGI would work.