It's called suspension of disbelief. It's actually, in the realm of the film, trivial. That's the way Batman looks. Either you like it nor not. To say that it dampens your view of the film because of that...well, it's almost like criticizing Casino Royale
because Danie Craig had blonde hair.
And I'm aware many people hold Superman
in high regard. It's a great film. But there have many many films since then in the genre that have easily surpassed it.