After reading all the posts above, I'm guessing that many will not enjoy my thoughts on this movie. I was a little bit surprised that I didn't enjoy this... in fact, I thought it was pretty poor. I've enjoyed the other "Marvel" movies in the past for the most part.
Yes, the action was cool, but after tolerating an hour of poor script; an hour or so of flat-out action wasn't going to cut it for me. I ended up sat there waiting for New York to be destroyed enough that I could leave the cinema.
One of the main issues is that dialogue tries too hard to be witty and falls flat; then the serious conversations are just too melodramatic and overtly cliché. I was sat cringing whenever Thor or Loki were talking.
Possibly the only part of the movie I genuinely enjoyed was to finally see the oh-so crap antagonist be slung back and forth in to the floor by hulk. Mainly just so I didn't have to watch him open his mouth.
Whilst subjectively I think this movie is crap, the action is some of the best Hollywood is capable of churning out; though it's annoying that this film will probably take an undeserved place in film history over this. It's a poor unoriginal movie caked in explosions, pretty CGI and whatnot- thus this means that everyone will automatically love it...
What's worse is the sequel sneak-peak mid-point in the credits; for me it just translated to "Hollywood wants more of your money to waste on ---- like this".