Well, comedy is kinder my thing, especially if it's an adult comedy, but since I haven't watched this, I can't tell if there's a balance in the overall story.
I personally love all movies starring Chris Hemsworth so far, so I doubt it as much as you do, but I totally get it if it lacks the full-blown action pack that it's supposed to come with.
The movie is fantastic, a lot of detailed effort was intergrated...the effects too.. But the rating.. Nay