We finally saw this! Helluva movie, innit? I am not going to do much of a plot + critique writeup because it seems that everyone all over the Intarwebs has already done so, week ago.
In a nutshell, Loki (yes, that Loki) steals a strange, powerful
McGuffin artifact from a secret lab on Earth and plans to trade it for an invasion force of aggressive aliens. Nick Fury of the spy organization SHIELD assembles a Ragtag Bunch of Misfits response team consisting of the Black Widow, Captain America, the Hulk, Iron Man, Hawkeye (eventually), and Thor (who is, as you may recall, Loki's brother, or half-brother, or adopted brother). Major mayhem and hundreds of explosions ensue.
One striking thing that many have noted is the lack of classic intrusive male gaze in the movie. There are a number of fan service-y, shots, but the men get them as often as the women. And among the women, the usual camera target is Fury's deputy, Agent Maria Hill, rather than the Black Widow, who gets to play as one of the team to a degree that made me very happy. No, it's not perfect in that regard (as has been noted, despite several named female characters, the movie does not pass the Bechdel Test), but what is?( Cut for list of thoughts/ideas, with spoilers )