I saw Captain America last night. I enjoyed it but would agree liked the IM1 the best of all the Avenger "prequels". I've never been much of a comics guy so I don't really know CAs backstory... but I did like what I saw. I didn't realize that Stark would play such a large role in the movie... that I liked.
The Avengers clip at the end was cut so fast it was really hard to make anything out... I suppose that is what a teaser is supposed to do. I am looking forward to the Avengers for sure.
Now, I need to go back and watch Thor since I missed out on that one earlier in the summer.