Fever Pitch is a fun enough movie. It has a lot of funny moments (including a hilariously disturbing shower scene). Like most romantic comedies, it has a "dead zone" in the middle where all the heavy, "she's breaking up with me" stuff happens, but other than that it continues to be funny until the end.
Even though the plot revolves around fanaticism towards the Red Sox, it's not overloaded with sports. You don't have to be a fan to enjoy this film.
Of course that's easy for me to say: I've been a Red Sox fan since I was a boy, too.
7 out of 10.
Barky