I don't understand why this show has a fanbase though, while Batman and Robin
which also went the campy direction, is hated by everyone? Aren't they pretty much the same thing?
Campy doesn't mean BAD. The TV show is a fun romp. Batman and Robin is a BAD movie, regardless of its attempt at camp.
Watch the Batman movie from the 1960s, then watch Batman and Robin and I think you'll see a difference, they are NOT the same thing.