I've been a movie buff (or "geek" if you prefer) for years. I've seen great movies and crap both. In most cases, the reasons a movie becomes one or the other are predictable, and are a direct result of the current Hollywood system, which is basically anarchic Bedlam, at least by traditional business methods and doctrine.
I've often thought of how a studio would look, and what it would produce, were it modeled after sound, workable corporate models, and run like a real business, rather than as a massive ego-boost. I've actually designed such a company in my head, top-to-bottom.
If it existed it would KILL Hollywood.
Ironically, a lot of the system's rules are even now being re-written, by "the most unlikely of creatures"...a plump, bedraggled, unkempt Kiwi, who has just happened to make over one billion dollars in the past year, and has done it outside of Hollywood's purview.
By the time he's done, Peter Jackson will have made at least three billion dollars in grosses alone. That kind of success moves mountains. I'm watching, hopefully.
There are such companies that are something like you describe, but they're not in Hollywood at all. They're mostly Asian/Australian/New Zealand production companies that run lean, efficient operations relative to the Hollywood flatulence-generators and have no time for silly stuff like endless meetings, 'focus groups' or overt political posturing. They're the ones that made Xena what it is (Asian cinema influence in both cinematic and business practices) In business and process aspects Hollywood could learn from them.