I think the strike zone, while hard to call, is called correctly most of the time. The Umpire is usually very good at making the call and all those instant replays prove it to me. While it is very hard it is still more cut and dry than B-Ball. How many times have people been called for a clean block because they pushed the shooter down with the ball. Perfectly legal but it happens all the time. How about charging or defensive fouls. There are so many they let go by as well as so many that don't deserve to be called. Its a game where you don't want to slow down the game by over burdening it with ticky-tack fouls but you also don't want to let people get away with stuff. That is highly interppertatable(is this a word?). That is why I think basketball is the hardest sport to call over all. There are parts of other sports that are hard to call but almost all of basketball is hard to call.