Begins is very much a film of it's time. Currently, the tastes are 'realism' and gritty, hard-hitting violence. Nolan's approach is all about convincing the viewer that Batman could exist. This, in itself, is problematic, because you don't need to do it. The audience already accepts, already buys, Batman, the Batmobile, the costume, and so on. You don't need to convince them to suspend disbelief for it, they want to, they pay to do so.
Story-wise, Nolan's approach works, telling you how Bruce Wayne built himself up to be Batman. Character-wise, it doesn't work, because it takes all the mystery away from the character. Burton knew that the Batmobile should just appear from nowhere, no idea where it came from or who could possibly have built it. That is far more effective. It suggests Batman has a hidden presence behind-the-scenes, and you don't know what to expect from him. And look at Keaton's face - there's no way he's going to let you in. That's why Kim Basinger's performance is so ideal. She reacts just the same way the audience reacts to everything.
Same with the main character. Nolan always lets the viewer know what Batman is thinking and where he is going. Burton shuts that off, and we see Bruce's crazy world thru the eyes of Vicki Vale, which IMO is a far better way to approach the character in a movie. The audience should empathise with Bruce, but he should never be an open book. And Batman should be, just like in that final shot of him watching the Batsignal, distant, alone, and heroic.
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