Finished it, loved everything about it!
Basically the crux of it was that they took the franchise in a completely different direction than Revelations did, aesthetically and universally; they aimed for a younger audience and made it stand-alone, not tying in to the 80s franchise in terms of visuals or story. Like 666 says, there's also a strong element that were angry that it was "too PC", with people of all different ethnicities, ages, sexualities and body shapes.