As was noted in The Last Avengers Story; superheroes have morals, but supervillains have a work ethic. The only exception in the Marvel universe is Captain America. When the shits hits the fan, you can't afford narcissism or alcoholism or any of the other flaws present in the rest of the Avengers.
In a real crisis, you need clarity, leadership, and a plan. And that's what Steve Rogers brought to the table, every time. No one catches the Cap'n with his pants down.
He was always the best of them. He didn't need superpowers or any sort of offensive weaponry. His only weapon was a shield, wielded at the absolute peak of human potential. No one could approach Steve Rogers' tactical awareness in a combat situation, not even Tony Stark with all of his gadgetry. He was and is a true role model, a natural leader - everything that all men aspire to become.
Thor can go fuck himself with that hammer. Captain America is the pound for pound champ.