I played it for about 3 hours yesterday. I think it's a great launch title. (Comparatively more difficult than the recent 2D Marios.) Miiverse wasn't working in-game for me, but if you launch it from the dashboard its pretty cool. I think Miiverse is the big secret with Wii U; I can draw a bunch of dumb images to send to my friends and post them in any gaming community. I'll admit that it's a lot of 2D Mario, too soon. But I think it really showcases the Wii U controller and the TV stuff pretty well.