Why RocknRolla sucks

Now I have finally watched Rocknrolla. First I must add that I liked Lock Stock, and Snitch, so I am (was) something of a fan. However, Rocknrolla does not deliver. Many of the cast including the lead roles don't appear credible. They don't seem the least bit dangerous, and the dialogue often sounds like someone is reading too long lines from a telepromter. Not even Jeremy Piven, my favourite from Entourage delivers. Ritchie's movies are usually Tarantino-violent, Rocknrolla is slowpaced till about half through, where it gets going a little bit, but then loses momentum shortly after. And now Maddie broke up with him. Maybe she said: If the next one is a dud, I'm moving back to the USA...