A couple per year, mandatory.
While I'm really not a sports fan, our school had some school spirit in it, which made it more tolerable. Plus, it usually fell over two periods I didn't like, so I didn't have to go to class.
So I'm neutral.
Fun side-story: For various reasons that I don't want to elaborate on here (we're not in R&P, and it'll take forever to recount), we had a mandatory rock concert at our school. It was so loud that me and my friends fled and played cards in a different building. A teacher showed up and said "Why aren't you guys back at the concert?"
We asked "Why aren't you?"
He joined us in our card game.