I was a smidgen let down with O12. It's not that I didn't enjoy it. On the contrary, it was very well made and there were some good twists as SC mentioned.
But it didn't seem like the 12 were in control of their destiny so much as they were in O11. That said, it had a pretty cool indie style to it, and the European back drops were nice to see as well (including the cameo from the Aresnal trainers during the first half). Including Bruce was a great touch as well.
Oceans 11 is a theatre show and a DVD to own. 12 is just a rental.