I also understand where people are coming from with the Captain America vs Man of Steel comparisons.
Man of Steel was a very uneven movie for me. I thought the effects were nice enough, it was nice to have Superman engaged in an actual fight scene, I liked that Lois Lane was this proactive reporter that was able to figure out Superman's secret ID from the get go, I liked Pa Kent's talk with Clark about how, whatever man he decides to be, he's going to change the world and the philosophical take on Krypton was interesting, this notion of freedom of choice versus doing what the world expects of you. Even Zod was actually understandable as a villain, as he was just doing what his people had literally bred him to do, and it showcases the flaws in the Kryptonian way of doing things.
At the same time, they sort of betray the spirit of that debate by having Clark spend the movie doing what both of his dads tell him to do. Pa Kent teaches him to be so afraid of the world that he'll die in a beautifully shot but mind-numbingly stupid fashion, Jor-El talks about the freedom of choice, but keeps telling Clark what he should do with his life. Superman technically is responsible for personally rescuing more people before he puts on the costume, rather than after. He has the worst kept secret identity in the history of secret identities. And then there's the well known destruction, the fight scenes that overstayed their welcome and were hard to follow and the killing, followed by him having light comedy with a general.
And maybe it was just me, but the idea that Clark would not stand up to a bully, but secretly destroy the guy's truck was just not something I want to think about from a Superman character. It's funny the first time you watch it, but then you realize this guy just lost his livelyhood, his job, and any number of other potential problems. I don't want a Superman that engages in petty revenge that could potentially leave a man homeless and jobless. The guy was a jerk, but for all we know he's normally an okay guy who just had too much to drink, and who has issues about big jock types trying to push him around because of his height. I'm not saying that excuses sexual harassment or picking a fight, but the punishment he received did not fit his relatively minor crime.
Likewise, the scene where Clark just flat out steals a guys clothes didn't ring right to me. When David Banner would find himself in a similar situation after a Hulk out and need to swipe some clothes, he'd do things like leave some cash on the clothes line or otherwise make restitution, because he was not going to let an unfortunate situation compromise his principals. It makes even less sense for Clark, who is in no danger of hypothermia and could easily use his powers to sneak around.
A pet peeve of mine was also that Zod was terraforming Earth to make it more like Krypton, commenting "What, you want us to spend months of pain adapting to Earth's environment like you did?" Let me think about that for a second Zod. Do I want to be uncomfortable for a couple of months where my body will adapt to an environment, the end result being that I'm a physical god that can fly around and lift thousands of tons? For a race of supertough warriors, this seems like a really easy question.
Man of Steel us this morally conflicted Superman who never really lives up to the whole notion of 'freedom of choice'. He spends the movie moping about his lot in life, feeling conflicted about his place and the world, being very dark and broody when he has to live with the curse of being raised by two parents that loved him and having godlike power. He should have exercised that whole notion of choice by saving his dad's life, consequences be damned. He should have smiled a lot more. He should have been shown using his X-Ray vision to make sure a building was empty before he punched Zod into it, used his heat vision to destroy debris as it's falling to the ground, should have actually been flying around as Superman saving people other than Lois Lane.
Captain America was someone with much more legitimate reasons to mope and be angsty, but who instead focuses on doing the right thing. He has a clear moral center and he makes every effort not to compromise his principals. Another reviewer pointed out that people are constantly telling Cap that he lives in a world of grey, and he needs to quit being so simplistic in his world view. Instead, Captain America's power is that he can simplify things. He takes the grey and divides it up into black and white, showing people what needs to be done, no matter how hard it might be. He cuts through the BS and finds the right path and walks it, and is willing to bear whatever consequences that follow. When asked if he wants to go over seas and kill Nazis, he states with perfect sincerity that "I don't want to kill anyone. I don't like bullies. I don't care where they're from." When facing an alien invasion that threatens the world, his first concern is with minimizing civilian casualties by containing the battle. When it comes time to overthrow SHIELD, he trusts in the integrity of the true SHIELD agents to stand with him against a threat to the world and do the right thing. He finds the right path and places his faith in better nature of normal people, and they rise to the challenge because of that faith.
Captain America is genuinely heroic, old school superhero, and they make him awesome. If they ever make a Power of Shazam movie, I'd want them to use Steve as a model for Captain Marvel, just with a bit more Spidey-style humor.