Street art is getting appreciated!

With its origins in the 60ies, probably in New York street art is finally being recognized as art. Sure, if used as a form of vandalism with just badly written words on a wall I definitely find it tasteless and a waste of colour and space. There is so many ugly concrete buildings just sitting around waiting to get a little artistic touch into their lives and darn it, does it make a difference. What kind of street art do you find more appropriate? Is it landscapes, portraits, famous artworks or just some Banksy style art? I would love to hear your take on this.