I think some of the worst CGI I've ever seen was X-Men: Origins Wolverine. He had shitty looking CGI claws, some of the backgrounds looked horrible, and some of it looked like PS2 graphics.
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The list could be extensive. CGI is severely overused. Star Wars - TFM, unbelievably bad CGI in so many places The Frightners Hulk I could make a long list of ones I recall, but I am on Vicodin right now for tooth pain, and don't feel like being negative. The one thing that just occurred to me. The Harry Potter series was filled with CGI. Loaded with it. But, the fact that it was all based on magic, the CGI never looked 'bad' to me. It's almost like it fit the design of the story. Come to think of it, none of the CGI in it that I can recall looked bad. Interesting.