Funnily enough, the last time I saw this (a few years ago) I actually didn't care much for it. However, upon re-watching it today I've had to make some serious changes to my evaluation. Honestly, now I can't sing this film's praises enough. I had such a great time watching it. The combination between he gritty sepia-toned style and the lightning fast dialogue really worked out great, so freaking entertaining. 10/10
Watching it again after many years, the 'witty' verbiage rings more self-conscious than impressive, as does a filmmaking style thoroughly soaked in Tarantino and MTV. Its posturing gangster masculinity is also irksome if that kind of thing bothers you (didn't then, but it does now). But it's still a fun watch, and the narrative gymnastics have lost none of their sheen despite Ritchie subsequently rehashing himself.
This movie is so extremely similar to its "spiritual successor" Snatch - including several of the same actors and some very similar songs - that I find it almost impossible to judge on its own merits. I can only judge it based on how it compares to Snatch and in that regard, it is inferior in every way. It's fun enough on its own but I can't find much reason to watch this when Snatch exists. It gets a B-.