While Asgardians and such are aliens in the MCU I do wonder; It has never been SAID that Asgard and Earth, Jotenheim, etc all exist on the same physical plane. In theory, if they CHOOSE to, Asgardians can still be an advanced alien race from a different dimension/plane of existence. Perhaps Asgardians can come from a part of the universe where matter is denser, which could explain why Asgardians seem so impressively durable, by the MCU standards.
Even if they are not advanced inter-dimensional aliens, on MCU Earth, Norse Mythology still exists and in the mythology, Thor and his race of aliens are "Gods".
This all being said, I hope this film has that epic feel, showing large scale events and characterization which early man may have misinterpreted as Gods. Thor hasn't really had that "Godly" feel since Thor 1. With all these larger than life characters, and what appears to be at stake, I think there may be a chance this ends up being the Thor film us die hards have been waiting for.