Starting? Hate's gotten ridiculous since a good 2-3 months. In these boards at least. AvPR threads pop up like fungus, and as you say, they always boil down to the same damned thing. We should make an official AvPR complaining thread or something.
Regarding no Aliens being in Prometheus - look at the positive side: they could've retconned things out and showing us the Alien's skin folding out to reveal a primitive space man. Or a spindly-limbed space dog.