I love Field of Dreams and Major League...
Does The Naked Gun qualify as a Baseball Movie? The part of the movie at the Angles game with all the announcers, and the blooper reel on the big screen, is hysterical.
But I have a candidate for WORST Baseball Movie of all time (might make an interesting discussion on its own) :
The Slugger's Wife
Michael O'Keefe (Danny Noonan from Caddyshack) and the extremely sexy Rebecca De Mornay. This one was totally lame, but I always found Rebecca De Mornay irresistable ever since Risky Business. That's probably why I watched it on HBO back in the 80s.