Whilst still a good movie, I don't enjoy Ocean's Thirteen as much as I did the first two. The comedy that Twelve brought to the table is gone, replaced instead by a pretty standard story that isn't too vastly different to what's gone before.
The standard of acting isn't great either, with the core cast feeling like they've slipped into some comfortable slippers. It's not a bad thing, really, but what does harm this movie is the fact that they don't really spend a lot of time together. Plus, Al Pacino hardly does anything outside of the double cross which sets this film off. His character is supposed to be manipulative and ego centric, yet hardly shows it.
Thirteen is easily the weakest film of this trilogy. It's not bad, in fact it falls on the right side of average, but it's not as good as the first two, and you won't be missing much if you don't watch it.