I'd love to see a bit more of George (not necessarily in any film) but Brad? not so much. I did see the old rat pack Oceans 11 on the telly the other day and it was far superior, haven't seen oceans 12 basically cos as you said dequels are getting a bit samey!.
having said that Toy Story 3 would definately be one I'd line up for
I really liked Oceans 11 but wasn't as keen on Ocean's 12. I do like George Clooney but I'm not a fan of Brad Pitt.
I'm never a fan of sequels as I think they are never the same as the original. Mummy and Mummy Returns was good and I did enjoy Scream and Scream 2 although IMO they should never have made the third one.
I always feel that it is a lazy way to make a film. They get a winning format and try and let it run and run.
Oceans 11 is my favourite film of all time, oceans 12 however, well I'm still convinced I missed something in that one. Oceans 13 I would definately watch, both for the cast and for the story line. I hope it would be as good as the first one though.