It's amazing - by far the best thing I've ever seen on TV. I've never seen anything else with such well-drawn characters, you understand the motivations and background of everyone, even those with relatively little screen time. And there are so many facets to the story. I'm rewatching it now, and I'm picking out quite a few things that I hadn't noticed first time round.

Basically, it's the best thing ever. I can kind of understand why it didn't get big audiences though: you've got to put a fair bit of work in to follow everything (you really don't want to miss an episode if you want to follow the plot!); it's got a lot of street talk (which the average white person in England... struggles with); and apparently a fair number of people were put off by a cast that was 70% black. Numpties.