Nope, Cap takes a seat behind Superman, the original hero and icon, and Spiderman, an odd and unusual story, but an insanely popular character and a great hero, but Cap has to take 3rd, just above Bats and WW.
Captain America is a leader.
Batman has led as well... but, get's pissed off and runs and hides.
Cap has been the last man to be taken down many times... same as Batman.
Cap is a team player... Batman can play a great game of chess with superheros.
Batman is the natural leader of any team... Cap is the leader of "The Avengers"... they pulled him out of the ice!
Superman and Spider-man are great... but, they follow orders from men who have no real super powers.
Ironically, Cap was probably created to make a "super man soldier" because Superman wasn't going to get involved in WWII.
Captain America is the best.
He and Batman have helped lead a young boy to be the 55 year old man that I am now.
Cap isn't as moody as the Bats.
That makes him just a tad better.
This post contains more truth than the rest of the internet combined!
It depends what you mean by "greatest," and what context, you're putting in. If we are talking about a hero known world-wide then it would be Superman. If we are talking about the "greatest," among comic book fans then that is debated, some of them might say Captain America, Batman, Wolverine or hell Iron man. If we are talking "greatest," superhero who shifted the way we see comics today then maybe Spiderman or Batman.
Personally he's okay but he's got nothing on Superman or Batman.
No way in hell, and I want emphasize how. Other than the Avengers, whats Cap got going for him on a media conscious level and being a symbol for the go to superhero that is basically the sign for new characters to be introduced and eventually become big time themselves? Cap being the American ideal and Heroic apotheosis is pretty bold considering he's not the flagship mascot nor the lynchpin global comic icon equvilent to Superman. In fact, I believe he's boring and weak without having hype and a reputation amongst the Marvel U's acknowledgement of his oh so obviousness jesus superman parrellels, as a character he doesn't feel to me what he says he is.
There is only on core constant that Marvel ascends over all other heroes and treats as a golden boy, or rather their ultimate underdog. So no, compared to that certain character which I will not name but hint "spins a web, any size" audaciously.
He is more human than superman and more compassionate than Bats, but he's just there to be ass kissed by everyone because his powers, personality and overall coolness factor is boresville.