Its a caper movie that just didnt have enough mguffins to keep it going. They wasted all their budget on the cast and had a really spotty story. All the successive Oceans are successively even more transparent.
Remember, the original Oceans 11 was a Rat Pack fest without much story.
The best little caper movie was "The Hot Rocks" dfrom back in the 70's. I hope they dont redo that one.