I would disagree with your contention that Loki was taken down. On one level, it's true, but the point of Loki is that he is a layered villain. You may be able to thrash Loki physically, but taking him out of the game??? That's a whole different ball of wax and what makes him so dangerous. You never know where he's going to reappear and you are never really are sure about his motivations. He plays a game within a game within a game....that's the essence of Loki. Physically, he's a bad ass, but not THE bad ass. From the mind game standpoint, tread very softly if you encounter Loki. Google "Loki god" and you'll see Mischief, Lies, Guile, etc. That's why Loki is such a great villain...and Hiddleston plays the role to a T. Great casting (once again) by Marvel.
EDIT: One other thing about Loki. His encounter with the Hulk was one of the very few times he seemed to let his pride get the better of him. Had he played the Hulk as he plays others, maybe he wouldn't have been "taken down" or maybe he knew that the Hulk wouldn't respond as others would and he played him in a different way? Might it have been Loki's way of getting the Hulk to walk away? A game within a game? This, IMO, is why Loki is so interesting. I don't think Loki is really a "Puny God".