In the movie art that came out ahead of the film, I thought Cap's outfit looked a bit lame. I thought the same for Black Widow and Hawkeye too to a lesser extent. The black in their costumes mitigate the superhero sillyness a bit. The armless look of Hawkeye doesn't make sense to me though. His costume is arguably the closest in rendition to an existing comic costume i.e. his original Ultimate one, but it doesn't make 'real world' sense to have no arms and no obvious bullet proofing.
I thought Cap's outfit was good enough to not ruin the experience. A good enough attempt at bringing it to the big screen. To be far to those involved with the costume design, it's a costume that's going to look silly no matter what. It had a slightly armoured look and the boots and gloves made sense to me instead of the Puss and Boots look. So, as far as I was concerned, it's better than his comic one and it was good enough for me to enjoy his moments in the film.
Contrastingly, Thor and Iron Man have a natural advantage when it comes to bringing their costumes to the big screen. Since both are very powerful characters it's easy to let your imagination tell you that a demi-god from another realm would wear something totally odd looking and that a guy in advanced armour would look futuristic. The lower power guys don't have the same, if you will, advantage of belief suspension.
The friends I saw this with are up for watching this again on Wednesday.

We say it in 3D yesterday and the first five minutes were shit because the projectionist must have fucked up the projection. I'd be tempted to watch it in 2D on Wednesday.
I didn't spot any easter eggs really. Reading an interview with Whedon, I don't think he intended to put any in. I assume the guy who gives Banner a pair of pants was a former creator though.
Obviously the post credit scene is a treat for the comic fans. Otherwise, nothing. Whedon wasn't aginst things that would come across naturally though, rather than a wink to the audience. So, I think the scene where Stark mentions Life Model Decoys could be considered 'natural dialogue' for the character rather than somply a wink to the audience.
Did you see Black Widow actually use her venom bite/sting thing??
Do you know why every now and again Europe or just the UK get the earlier release date? I don't get it. International, same day release dates I get. But, why a US film gets an earlier release date abroad I don't get. I sort of do get the possibility that May 4th is a big day for cinema sales though.