As of this moment, Deadline's calling $65 for the weekend. Not what it needed to be.
There's so much in this film that should have made it into the trailers--sweeping shots of them riding horseback on the rainbow bridge, any shot of Thor flying, the stuff with the monster on the crumbling ice mass at end of the fight at Jotunheim, Odin beaming down on his eight-legged horse.
Whoever put the marketing together obviously had some mandate that the space fantasy elements were to be toned down as much as possible. They tried to sell this to people like it was Iron Man, except it doesn't work like Iron Man, so most didn't understand the ads. How did they end up with a final poster that's just a headshot tinted red instead of, I don't know, your hero flying or hitting something with his huge hammer or calling down a lightning strike? This relatively weak opening isn't the film's fault.