To call it "even up" is an oversimplification of what is actually going on.I don't get the "even up" the fouls that a lot of people look for. I said this recently on here, but it bears repeating.
If one team commits 15 fouls and gets called for 13 and the other commits 25 and is called for 22, it was a well officiated game. If one team commits 10 and is called for 15 and the other commits 20 and is called for 15, the refs sucked.