Received and played this for ~2 hours last night, and was utterly bored by the end that I've already sent it back. You must be a tennis fanatic to enjoy this dumbed down tennis game (I will not call it a sim).
It is technically fine, as far I can see (smooth graphics etc), but just oh so forgettable.
Guess my 3DS is going back on its charger to rest for a while...
Very happy with this game so far. This game is different from Mario Power Tennis, you don't have super moves, instead you have different shots with chance shots or super shots of each one, like a super slicer shot or a super drop shot. The special mini games are fun, espicially the one where you can play through the old-school side scrolling mario game. Online has only single matches, quick or extended. It doesn't have doubles online, which is kind of disappointing, still though, this game is a must BUY.