From what I understand, the three big problems fans had with Burton's film were:
-Joker killed Batman's parents, creating him before Batman could create Joker
-Vicki Vale is let into the Batcave by Alfred
and the worst offender:
-Batman kills a lot of henchmen, when he shouldn't be killing anyone at all.
As a non-reader of the comics, for years I didn't know these different from those and they didn't bother me after learning of them because:
-I liked the idea of the villain unknowingly creating the hero, and the hero accidentally giving the villain a new lease on life.
-Alfred's letting Vicki in was probably related to what he said to Bruce earlier, about not wanting to grieve over losing his friends anymore, or his friends' son. Maybe he wanted Bruce to see there was more to life than Batman, and Vicki was a key to it.
-Batman's killing henchmen who were trying to kill him - to me this guy, especially after nearly being killed in a plane crash, was seriously pissed off and prior to that hell-bent on revenge. The rest (such as the men in Axis Chemicals who were lost when the Batmobile blew it up) were collateral damage as far as he was concerned. It may have been the ultimate violation in the comic fans' eyes, but as a non-fan I understood and accepted it for what it was.
Another reason I wasn't bothered by it is because this isn't just a comic character anymore. It's a live-action TV, cartoon, live-action movie, animated movie, all-around media character and sometimes people don't follow every form the character appears in, so there is no standard other than the one that made you a fan in the first place. Of course, there's obviously this idea that only the comics are the true standard that everything else must live up to. That's why there was a big issue of Heath Ledger's Joker when it came to his skin - it wasn't "perma-white" and that didn't sit well with some people. Of course that kind of thing sounds totally ridiculous to get worked up over, but everyone's got their preferences.
