Prometheus wasn't any worse than the run of the mill action movie of this generation. Lets see, it was better than Transformers, The Expendables, Capt. Amurica, Clash of the Titans (remake), The Immortals, any movie with Dwayn Johnson, and a plethora of other movies from the last 10 years, so forgettable I cant even recall their titles off the top of my head.
