Personally I have not seen it, but I am going today after work. From everything I have read this is one great movie. Below are some reviews, there are some subtle spoilers but nothing that I take as giving the movie away.
Further Reading:
-http://www.nydailynews.com/entertainment/avengers-5-top-secrets-marvel-ous-success-article-1.1071984?localLinksEnabled=false
-http://www.mtv.com/news/articles/1684447/avengers-reviews.jhtml
Further Reading:
-http://www.nydailynews.com/entertainment/avengers-5-top-secrets-marvel-ous-success-article-1.1071984?localLinksEnabled=false
-http://www.mtv.com/news/articles/1684447/avengers-reviews.jhtml