Rule 1: The correct Suit.
In order to please Batman Fans, you first of all need to visually please them. For every Batman movie since Tim Burton's Batman, The Dark knight has always went around Gotham City in an all black Batsuit. This is fine for a couple of movies, but after a while, it starts to get repetitive and boring. Its time for Batman to don his infamous grey and Black suit.
I'm not necessarily talking about an all spandex suit, although that can work if done right. I'm talking about an armored suit that has lots of defense capabilities. since Superman's suit in Man of Steel drew influence from his new 52 suit, why not do the same for Batman? His new 52 suit will work incredibly well on screen, and it will do something very different from previous films.
Rule 2: A more detective-like, awesome Batman
The next step is how Batman acts. The Dark Knight trilogy, although was good, lacked the fact that Batman is, above all else, a detective. In the comics, Batman would figure out almost everything by himself, with little to no help from other people. Batman also needs to think several steps ahead of his opponents so he can take them down with very little effort. There is a reason that he first appeared in Detective comics, and not Action comics, like Superman did, and its down to the fact that he does mainly detective work rather than action.
You should also have Batman say some really awesome things that make him really awesome. Just little things that add to the Character's personality
Rule 3: Fighting style and tactics
One thing that really annoyed me about the Dark Knight trilogy was the way that Batman fought. it was very sluggish and brutal. Nothing like Batman from the comics. Batman from the comics learned 127 fighting styles, all ranging from brawling to jiujitsu and more. He needs to be fast, agile and precise.
He should also use various gadgets in battle, ranging from smoke bombs to Batarangs. Just make Batman's fighting varied and skillful, not the way thugs fight.
Rule 4: No forgone conclusion
It may be Superman's movie, but don't make Superman wipe the floor with Batman. You can make Superman win, but dont make it a really short fight that has Batman completely destroyed. make it so Batman lands some devastating blows on superman. Maybe have it so one of Batman's smoke bombs is actually filled with kryptonite smoke so Batman can then have the edge and almost defeat Superman.
Rule 5: Bread and Butter
This is a weird title, but just hear me out. In the comics, the great thing about Superman and Batman is when they are in comics together, they were like bread and butter, which means in this movie they need to go well together, the boyscout personality of Superman with the dark, brooding Batman just goes so well together. Yes i know, Superman's personality may have been altered, but just make Superman and Batman go well together.
Rule 6: The Anti-hero
Throughout this movie, Batman and Superman should hate each other, so it would seem wise that Batman, for most of this movie, should be portrayed as sort of an anti - hero. Superman should be going after Lex Luther, and batman should see this and go after superman and ask him why is going after Luther and then they should fight, as an example. Just make it so Batman and Superman don't have an understanding and don't trust each other.
Rule 7: the voice
Whatever you do, dont make batman have that stupid voice that he had in the dark knight trilogy. for inspiration, listen to Kevin Conroy and Michael Keaton play Batman. what they do is put on a slight gruff voice, not the all out growl that Christian Bale does. People will take Batman more seriously with a slight gruff voice than a growl.
If all this is done, the movie should portray Batman as the Batman from the comics.