Still I don't understand how in the comics Batman as a member of the Justice League and can outsmart alien gods, but when he gets back to Gotham he has trouble with a guy with a hat fetish, its that kind of thing the movies should avoid.
When I think of realism in comic book movies I don't think of forgoing all fantastical elements from comics, I think of applying internal logic, keeping things consistent and having people react as like real human beings when dealing with things like super heroes and super powers.
Here's an example of things I had a problem with the old Superman movies and I liked those movies, but these elements certainly dragged them down. Superman spinning around the Earth and turning back time, not only does not keep sense of from a scientific standpoint, it also a bad plot point, if Superman can travel back in time, why doesn't he do that all the time, how can there be dramatic tension when Superman can simply go back in time and solve his problems before they start. Superman and the memory erasing kiss; all that build up with Lois' romantic sub plot and her finding out who Superman is, is thrown out the window with this cheap plot device. Again when the powers make things contrived, there is a problem. Superman is better off with a set number of powers, as soon as the writers have Superman pull new powers out of his butt as the plot demands, it just lazy writing.
Again there are things in the comics that I don't think ever worked very well. Having Captain Boomerang be the main villain for a Flash movie would be a mistake, because it isn't very believable that a go who goes at super speed would have problems with some guy who throws boomerangs. I think it make things realistic is to make things seem more consistent and less contrived.