I'm not a huge comic book hero fan, so I tend to enjoy the various superhero movies on their own merits. Avengers Assemble was an excellent movie, exquisitely put together.
So the follow-up movies have a fair amount to live up to.
Winter Soldier does not disappoint. This is not a kid's movie, though kids may enjoy it. It has has a darker tone which I really enjoyed.
The action was fun and the characterisation interesting and deep.