To be fair, Batman had his turn with the last three Nolan films, plus four Burton/Schumacher films. Add to that the fact that another solo Superman film seems to be very much up in the air at this point, it's only natural for Superman fans to feel like he's getting a bit shafted.
That was a totally different Batman. They need to make space for the entire justice league, and they aren't very good at striking the right balance. Marvel has it figured out, but DC can't seem to get the right balance.