Yeah, I think it's art. But I thought that it was more or less agreed these days that "Banksy" doesn't actually exist, or at the least most work attributed to him is lots of people, and some of his stuff isnt really artistic cuz they/he uses stencils etc. and not real free-hand?
But generally speaking i like most graffiti - not meaning the usual drivel/swear words which is just moronic vandalism of course!

I love his work, not only is it very skilled in most cases. I just love the irony and finger pointing.

Banksy is good but I prefer D*face