Very overrated, IMO. A total Tetris rip not worthy of my time.
You'll see these many other reviews that praise this game, but keep in mind that you might wind up like those of us in the minority who get no entertainment whatsoever from this game. So I urge you to try it out however you can, through renting, borrowing, stealing, whatever, before you spend a good deal of money on a game you could wind up sick of after just a few minutes.