Decent movie, although I think they should have cast someone other than Josh Hartnett as the star. I liked the plot twists although they aren't exactly mind-blowing.
The gun porn left a little to be desired as well, just a few silenced pistols and sawed off shotguns. Nothing terribly special.
Having said that, I don't think I've ever seen a truly BAD hitman movie.
I hope the upcoming Hitman: Codename 47 film blows it out of the water, though.