never saw ocean's 12 and now i am glad of it, seeing as i thought this one was fairly shit.
not as witty as 11, actors seemed a little bored/uninterested in their roles and tried to make them funnier than they had to i think. Also there were no unexpected plot twists or turns, no one you thouht was on one side and ended up to be on the other.
It was all fairly predictable and you knew what the ending was going to be like and they showed to everything that happened as it happened, rather than revealing their wit and clever plan to you at the end.