I just picked it up from the store and played through the first level. I only meant to play for a few minutes, but I felt compelled to play through the first boss. It was rather fun. The little touches here and there are nice. There's a lot of throwback touches, like the 8-bit style life bars and presentation. It doesn't pretend to be anything other than a fun action game. There aren't too many uses of the motion sensing other than finishing blows and wrestling moves. Those are handled pretty well. The art style is interesting, I liked it. I did have fun with it for the 30 minutes or so I played.
Do play the tutorial, just so you have a feel for all the moves you can do in the game.
One little thing that might get annoying is having to recharge the beam katana. I kept forgetting about that and would slash away, only to run out of a charge and getting my ass kicked before I could recharge it. So, just keep an eye out on your katana's battery level and you should be good to go.