I have no problem with CGI effects, but like any other aspect of a movie, it's jarring and ultimately unsatisfying when something becomes gratuitous. The Superman Returns / bullet to the eyeball is a good example. Everybody knows Superman is bulletproof, the Man of Steel, etc. We've seen bullets bounce off him countless times in comics, cartoons, movies, etc. Was anybody amazed to find out that his eyeball wasn't his achilles heel? I'm not saying shots showing off Superman's already well known abilities are all pointless, but a little restraint goes a long way.