As developers we think about how important coding is to a great game, which is very true. However, the visuals are certainly just as important.
Braid is a really fun game to play. The developer and art creator wrote a series of blog posts describing the process of creating the game. The index to the blog series is here.
This particular post titled “No Shame in Tracing” particularly hits the point home regarding quality art.
Go read the above links and check out my getting started with XNA Game Studio 3.0 blog over the holidays! :-)