I agree Captain America could be done better to especially in his own series. Although the one thing he needs in it is to use his shield a lot more. He is now being shown as more of just an average spy. He needs to be in costume more and in action.
In the New Avengers he is not being used as he should either he is getting put in the background instead of in the forfront. He needs to be shown more as the leader of the team. And shown using his shield more offensively and defensively.
Captain America has not been written the way he should be for a while now. It appears to be Marvel's way of updating the character. And in his own title the writer explained his actions are because of the Cosmic Cube being used to alter his personality but it is still going on and has been for way to long.