Thirdly, i personally would have hated to see him build everything himself. The same reason i would have hated to see peter parker make his web thingys in Spidey 1. Too much. They already build one aspect, its pushing it to assume he is wonderfully skilled in every area. And this is purely a cinematic thing for me. The comics can have the perfect humanoid Wayne, i like seeing a guy use what he has, and why shouldn't he? Batman moves too fast and in the dark for anyone to see what equipment he has anyway. Aside from the tumbler, which does bring up some problems.
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You don't have to be a genius to buy parts and assemble something yourself, like they did with the suit, and consequently those scenes played out very well. Then the car, the cape, the equipment, even the belt all come directly from other designers, engineers and Waynetech employees. Doesn't work for me. I'd be fine if Bruce was buying engines and car parts, using a variety of resources and people to help him. This movie though focused more or less on one very narrow source: namely a prototype division of WayneTech. Conversely, with the costume you had several dealers from all points of the globe supplying various aspects of the costume.
That makes sense to me. Getting an entire and recognizeable car from Waynetech doesn't. Compound that with the fact that most of his other tech comes from there and you can see the paper trail Bruce is building right back to his doorstep.
Furthermore Bruce doesn't have to be an expert in all fields, just really, really smart. For example, the line "was I suppose to understand any of that?" was an absolute killer for me. No, Batman doesn't have to know how to synthesize andidotes while in a coma, but in this movie they showed him as being unable to understand often times the knowledge being presented to him. In some regards we can say Batman is young and learning, but my problem is if you want to show Batman young and learning establish that element much earlier. Most of his origin in that movie solely focused on the fighting, making him look downright inept at the other areas: detective work, forensics, science, engineering, etc.
That's, in the end why Joe Chill's hearing was a distraction for me. It distracted from Bruce's development. Rather than have this boy become a determined crimefighter through his own strength and will, we saw a very aimless character waste valuable time. Time in the movie that could have been spent establishing his zest and determination to learn about crime fighting and criminals.
I thought another problem, was Joe Chill being caught showed the effectiveness of the police. Bruce is someone who works outside the system, who believes it can't work. He came to this conclusion when his parents' murderer was never brought to trail or caught. Gotham in this movie seemed much less corrupt, and much more efficient at dealing with crime. Batman started more of a "War on poverty" or a "War on bad men who wronged him personally" than a true "War on Crime". Whether you liked the outcome or not, Joe Chill served his time and was released a sincerely repentant man.
In addition, back to a criticism you had made, Joe Chill's release was really more of a plot device to bring Rachel Dawes into the story rather than to really further Bruce's development. Rachel Dawes ends up pushing him, or at the very least guiding him to become Batman. I find this troubling as well, since something essential to the Batman story is how his family (Alfred) seemed to try to dissuade him from becoming Batman. While Rachel never actively tells him what to do, her impact ends up being more profound than his parent's death in a way. His parent's death turned him into a murderer (would be murderer), then Rachel convinces him otherwise.
As you point out though Rachel becomes pointless after that, becoming little more than Dent's girlfriend in the second movie, and frankly a role that could've been filled by Dent from the beginning (as Nolan had originally planned). Dent also probably would not have had the same impact as Rachel, but would've been more important to the plot overall.