We've got Halo:CE, Age of Empires and I think Call of Duty 2 on ours. But yeah, my politics teacher uses YouTube all the time. It's really useful for getting up debate shows and programs that we don't have the DVDs for.
Yeah, we had Halo, I think Unreal Tournament and AoE as well. Now in university it has been useful, for the same reasons as yours for pulling up debates in classes. My Greek civ. professor showed us the Monty Python sketch of philosopher football as we studied philosophers

Definitely useful in "higher education" but in high school, where mostly nobody tries YouTube can be a disaster.