Your kids won't have the attention span to play a game that only means something if you're an avid Sega/Tennis fan.
Story: There is pretty much no story, and if you haven't played previous sega games, then the levels also have no history. 5/10
Presentation: The graphics aren't bad, and the Sega characters make their comebacks. 7/10
Gameplay: Obviously tennis, and designed for little kids, the tennis matches take way too long and for the parents, it just isn't worth buying this game your child will enjoy (or pretend to) for less than 20 minutes. 4/10
Design: The game is way too tedious for children, and the mini-games are pretty much worthless. If you want to play online there are pretty much no servers to find. 5/10
Overall: 5.25/10
Your kids won't have the attention span to play a game that only means something if you're an avid Sega/Tennis fan. But for anyone else, I suggest you leave it on the store shelf.