A minor epic a major mistake?

On another point the promise of an epic was exaggerated beyond belief, if they had included some kind of Archaeological dig, and discovery of alien skeletal remains, and a young peter weylands obsession with an alien find that propels him to fund the prometheus project, that would of given some credence to the massive expenditure of the expedition to search for these alien life forms. They could of included the seminal moments of the first successful artificial android life breakthrough, funded and implemented by weyland,... the very first david model off the assembly line for instance, and the motives for sending him on the mission etc, although that parts obvious to monitor crew and minor ship maintenance i guess, but also any underlying agendas he may have been programmed with etc. And of course the motivation for creating life on earth by the engineers in the first place, and some kind of reasoning of just why they want to destroy us thousands of years later would of helped the movie big time. The pacing of the film and execution of character plot is daft in parts it beggers belief just how these things got filmed and what on earth were they thinking to allow these frankly silly plot holes to escape notice is beyond me. The sequence with the cobra alien stands out i mean why on earth would you try to coax an alien life form to try to pet it like its a fucking kitten when logic would tell you that not only is it potentially dangerous from a physical point of view, but that it could lead to contamination, and all kinds of unforeseen consequences. Why wasn't it just a case of the biologist stepping into the vicinity of the cobra alien creature that triggered an attack much the same way as humans sometimes do when rattlesnakes feel threatened on their turf , to me its a far more simple and plausible plot device. Again theres a scene with holloway who gets burnt to death while still alive, when a more humane thing would be to just put a bullet through his head and burn the body later. There was so many bad character choices in the film i cant help think why wasn't it picked up in daily's or the edit ?. Its one thing to have ambiguity in a film and not spoon feed an audience motives, and then theres just plain stupid, prometheus suffers from the latter on several occasions and if they had given us the epic we were originally promised these gaping holes could have been filled very easily and instead of an ok / good movie - we could of had a masterpiece /instant classic, acclaimed by the majority instantly. What we needed was the 3 hour epic film to give depth, credence, detail, and plausibility, and subtlety, needed to satisfy a scfi hungry world sick to death of popcorn, half assed summer blockbuster fodder. If fifield never made it back to the ship when he had all of his faculties how on earth did he manage it when his dna physical body /brain structure had been radically altered ?. I liked prometheus but i wish so much they had put a slower pacing into the film and included things like a young peter weylands roots, and reasoning beyond a few cave paintings . The enormity of weylands wealth, and power, and the genesis of artificial intelligence, and so much more. The alien visitations to earlier tribes people etc, and a sequence of mans evolution from the primordial sea, and the various stages of mans development would have been truely epic etc. There were so many things they could have done to make it a brilliant lifetime experience. Prometheus does have some terrific moments of course its not all doom and gloom, theres some quite excellent sequences but it wasn't anywhere like the epic i was lead to believe we were going to see.