I loved the Tony/Pepper scenes. Love Gwyneth. Their chemistry is great. What makes the movie worthwhile is that the characters are charming as people and the dialogue is smart and fast. Downey doesn't dominate either as Stark or in terms of his (considerable) talent - Rogers and Banner are great and very specific. Romanov is surprisingly vulnerable, but you could say that about most of the characters including Loki. The two who get short shrift, really are Clint - we don't learn anything worthwhile about him - and Thor, who remains a dullard despite Hemsworth's evident talent (or maybe Hemsworth sees him as a stolid bore and that's what he's going for). Samuel L. Jackson is just Samuel L. Fucking! Jackson, which is cool.