While not every element of the game is on the same level of polish, the overall package gives you so much to do that you could conceivably be running around Bullworth for several dozen hours. Beyond the core missions, there are a ton of side quests, arcade games, and more to occupy your time.
There are also a few two player modes, but they serve as more of a distraction rather than anything substantial. Still, if you're looking for something on the Wii to really sink your teeth into, Bully: Scholarship Edition may be just your thing. It's not perfect, but it's a heck of a lot of fun.