I don't get it. Its because of Batman & Robin (1997) that Batman Forever gets lumped in with that travesty and assume Batman Forever was just as bad as Batman & Robin.
First of all, Val Kilmer was a good Batman/Bruce Wayne, and was more right for the role than Keaton. Not to mention that both his Batman and Bruce Wayne had far more depth and character development than Keaton did in either of Burton's films.
Batman Forever was much true to the Batman mythos than Burton's films, especially Batman Returns (1992). Joel Schumacher at least made an attempt to understand Batman and his world. Batman doesn't kill in his films, nor does anything ridiculous happen like the Joker killing Bruce Wayne's parents.
I get Batman Forever was a little campy, and had bad executions in some parts of the film. Tommy Lee Jones' Two-Face should have erased from the film completely. But its no worse than an army of rocket wielding penguins or having the Penguin eating raw fish.