The effects saved the film.
Wanted wasn't the worst movie I've ever seen, but it was a far cry from begin great. The plot was somewhat predictable, the acting was decent, and the effects were amazing. Its hard to write this movie off because of its flaws when the the effects make up for a lot of its misgivings.
I definitely feel that there was a lot that could have been improved upon, but I gotta give it to the artists in this film that helped make the effects as they are what carried the film.