I don't remember the effects; all I know is the premise is as retarded as "The Day After Tomorrow." And CGI effects almost always look like something out of a Saturday Morning Cartoon (see the Star Wars prequels, Pirates of the Carribean).
Mind you, there are exceptions, but even Lord of the Rings had obvious CGI. I look forward to the day when it can actually be convincing. In the meantime, I go to the movies for a good overall experience, which includes character development and story--and excludes drivel like Transformers, G.I. Joe, and probably 2012.
I'll grant that blowing up a Muslim landmark would at least have made the movie somewhat worth watching, however fake it looked in the process. I would have waited for the DVD, though.