That's enough Infernal Monkey. We get the picture.
As mentioned, these are killing time games. Think Bookworm or Bejeweled. That type of game. You play some to wind down and maybe kill a few spare moment. they are not "Final Fantasy XVIXVIX: The Sport Of Reckoning" where using an insanely complex system of upgrades and a battle systems that is totally different then the great ones they had before will win you a 15 minute long ingame movie for every contact with the ball (Which is in fact an alien invader plotting to take over the world by using the energy that it collects being knocked around as a tennis ball to remold the world to it's vision). Any story that would be appropriately brief would be hokey. No story is better. I do think that it's funny that there is a camp here that doesn't like the models because of there plasticy look but love the Pokemon Wii video and there severe plasticy look. If they bumped the level of detail up to say looking more like an actual fisher price toy, you know having something better for hair. How would you feel?
I can see a little game like this having ways to open new costumes and accessories. So you start with Mr. Basic. Then you play enough and have hats, vests, hair, etc the standard stuff. People like those sort of things. Even better yet you can win those things from acheiving stuff in other games as well, much like getting a new trophy in Melee from having a certain game saves on the same card. So now you have a reached a level 60 character in WoW Wii. Loh and behold when you go to play WiiTennis there is a plasticy version of you armor that you can equip onto your player. Sweetness. Or you completed your collection of all the Mario games on VC. Now you have the covetted Mario Hat for your character to wear into Homerun slugging battle. The characters could get very interesting very quickly this way. There are possibilities for such basic beginnings. From what everyone says the gameplay is solid.
Now on another note. Where is all the news Nintendo promised. They said that they would be releasing little bits of information all they way up to launch and we've barely gotten even crumbs. It's mostly "he says that she says that they said" very little real data from the source.