Considering how many of their good games were already released on previous systems, I'm not surprised.
I mean, the best game so far is probably New Super Mario Bros, but we've seen so many incarnations of it already that it didn't really feel necessary.
I love it, though. Love Mario Bros and am playing through Arkham City again, which is obviously phenomenal. I really like the Game Pad design, too.
Sales will pick up when big games come out.