I saw it this past weekend and was pleasantly surprised. I thought it would be the stupidest turd of the summer, but it was ultra-violent, the characters and acting were good, including Angelina, who I absolutely cannot stand, and the humour was funny and subtle at the same time. Morgan Freeman was refreshing; he plays a part which is unusual for an actor of his caliber here, and it's good to see he isn't above certain movies like this one, which are just plain fun.
As for the bending/curving bullets thing, it's a secret order of assassins and only a select few people on the planet apparently have the ability to do this. It's akin to a superhero ability in this movie, if you take the assassins (called The Fraternity) to be superheroes of a sort. If you question the bullet bending, it's like questioning Superman flying or the Hulk using a police car to spar with The Abomination. Other than shooting bullets from across a city and around buildings and stuff, the assassins can flip around, run extremely fast, jump from building to building, flip their cars and shoot people whilst doing it, etc. etc. etc.
So yeah, if bending bullets makes you scoff, you ain't gonna like this one.