It wasn't easy, but I finally found something about MediaBox which I think is less than great. The screen is typically too cluttered, mostly (I think) because a lot of real estate is taken up by the menu on the left. When I'm looking at the list of artists or albums, for example, there isn't much room and the song names are in a small font.

Of course, this is largely an aesthetic complaint, and perhaps I'm alone in these thoughts. I'll cheerfully admit that Martin has much better taste than I do.