A brief review just having seen it:Pros:- Loki was even better than he was in Thor. Hiddleston has more fun than all the other actors combined, and it's contageous. I'm not sure whether Loki's actually a great character or if Hiddleston's just really fun playing him, but the end result is the same.- Hulk was very well realised. They left him as late as they could and paid off when he finally arrived. Less really is more with this guy.- The lack of sentimentality, and the right amount humour. Mercifully they didn't go overboard with the comedy, but Hulk punching out Thor near the end, or Loki's request for a drink ensured there was just the right amount of laughs.- The last half hour. Obviously.- Good hero interaction. It'd be an exaggeration to say there was much character development, but I liked seeing these guys disagree and, finally, get on. I found myself wishing they'd all gotten together sooner so there could have been more of it.Cons:- The first 40 minutes were curiously rubbish. It wasn't until the scene in Germany that I felt at all involved in what was going on.- Black Widow and Hawkeye were pointless. No reason for them to be around and I felt increasingly annoyed that they were.- Like Mission Impossible 4, it was too long for a film that was essentially relentless action.- Thor celearly got the short straw in terms of character focus, and I didn't entirely buy Cap's sudden commanding role at the end. It felt like they had to give him something to do because he was stuck on the ground fighting foot soldiers. Talk of the film being from his POV was clearly bullshit.Overall:That this film is not just coherent but actually good is kind of amazing. Credit to Marvel: they gambled and won. I'm sure many others will enjoy it a lot more than I did because my threshold for action isn't that high, and that's really all this film is, but it's a very solid way to kick off the summer. I'll watch its box office with great interest, although I'm not much more excited for future solo sequels than I was before seeing this.