Like the others I've seen, RocknRolla has plenty of coincidence, a lot of characters, a complicated plot, some heavy violence, and quite a few laughs. The plots have to do with robberies, Russian gangsters, a stolen painting, drug dealers, and other things. Everybody's working on some kind of scam, and all of them intersect in ways that I find surprising and (almost) logical. The cast is uniformly fine.
There's at least one big loose end left dangling at the end, but we're promised that most of the cast will be returning in a sequel called The Real RocknRolla. I hope Ritchie will go ahead and make it. I'm waiting.