I downloaded the demo on the PSN, and really that demo is exactly what you get in the full game. It's fun for a few matches, but the mini games tend to be very redundant. Basically, you unlock mini games that include running around collecting coins or hitting tennis balls into things. Fun, just no lasting replay value here. The only real excitement I got with this game was playing against another person (not AI).
I attempted to play online once and had no luck. I must have literally been the only person online trying to get a match going.
Fun, worth getting from gamefly, just not worth a purchase.
If you never owned a Dreamcast (and loved it), you're probably not going like this game. But if you are (or were, in my case) a huge Sega fan, a fair amount of nostalgic joy can come from playing Superstars Tennis.
As a tennis game, it is very basic with only 2 buttons used for shots - but you'll find yourself mostly using one. The tennis gameplay could best be described as "Virtua Tennis Lite" - there's even a nearly impossible bonus stage after completing the tournament/arcade mode. Each character has their own power up (much like a Mario sports title), but they don't really add much to the action. The controls are responsive and work well, just suffer from being too basic.
The meat of the game is the Superstars mode. Here you play through Sega-inspired tennis mini games. You'll hit zombies in the Curien Mansion area (House of the Dead), break puyos in the Puyo Puyo Fever area, paint tags at the Jet Set Radio area, etc. As you progress through Superstars mode, you'll unlock characters, music, ballgames, and courts. I haven't completed the game yet, but it doesn't seem like it's going to take very long to make it through all the areas. Each mini game does provide a decent amount of variety though. And more importantly, the mini games are better than the actual tennis matches and make better use of the simple controls (I thoroughly enjoyed the Puyo Puyo area).
I would have liked to see more characters in the game - you start with 8, and unlock an additional 8. The Superstars mode lacks the depth and replay value it needs, and the tennis is on the basic side. But if "Jet Set Radio," "Space Channel 5," and "Samba De Amigo" bring back great memories for you, you'll probably enjoy the trip down memory lane. The colorful courts breathe the life of the games they were inspired by - but won't matter if you're not a fan of the games. Overall, it's a fun tennis game with little depth. Perfect for a Sega fan to rent, but probably not enough for anyone to purchase.