Nintendo recently released the first Wii game to offer real-time online multiplayer, but it still has a long way to go just to catch up to where its competitors were in the last generation...
Nintendo's favorite guinea pig, Pokemon, introduces the Wii to online gaming with Pokemon Battle Revolution. The game itself has almost no depth to it, and it's essentially marketed that way. It's nothing more than a chance for fans of the pocket monsters to take gaming online and connect their Nintendo DS battles to a Wii console.
There's also no "matchmaking" system like what's seen for the Xbox 360. This means a 10-year-old kid new to the world of video games could easily be pitted against a 40-year-old gamer who has mastered the intricacies of raising specific Pokemon stats. There's no way to set up matches between equally ranked players.
In comparison to the other consoles Nintendo has some work to do before the Wii can be considered a true 'next gen' console, so far Nintendo cant keep up with the leading consoles in the area of online gaming.