To all the people worried about over the top patriotism and tie in movie goodness, fear not.
The thing I've loved about Captain America as far back as I can remember is he stands for more than being an American and a patriot, not to say that he isn't and that isn't one of his founding principals, he was a propaganda tool after all, but he stands for something more.
Chris Evans portrayal of Steve Rogers really brings this across, he's is what we should aspire to be, something more than the average citizen and I think people of all nations can relate to this ideal.
There is some good ol' American yahooing and some points, but by and by its a comic book movie that I think everyone can enjoy equally.
Now to address the whole other movie tie ins, yeah it helps to have seen some of the other movies to get the bigger picture and the grand scheme thats at play in the background, but as a stand alone film it works superbly, and its not like the tie in bits are that hard to understand in the first place. You can walk into the movie having never seen any of the other Avengers movies and still be completely in the loop and feel like you know whats going on throughout.
tl;dr Captain America is great fun to watch no matter who you are or what other movies you've seen