Rather than go lord of the rings they went x-files. Yet they have frost giants and trolls. The end result is a lack of a clear and distinct identity or cultural hook.
Perhaps they can pull a transformers with it although, let's face it, the Destroyer blowing up cars in a small town is hardly epic.
Frankly, they've deviated so much from mythology, which was based on magic and spells, cunning and courage, I fear that the public will see this as just another bash fest between aliens. I really hope they can pull a Michael Bay with this one.