[vacri]

In this case, not sad at all. As abat says above, these pieces look flat and boring. Usually Banksy's work melds with the environment it's in, often in clever ways. Taken out of that environment, it's just stencil art. The special essence has left, and it does become boring.

[prawn]

It's basically a Threadless t-shirt design in concrete or canvas rather than fabric.