You're not arguing for a consistency of character. You mostly sound like someone that as simply hasn't read or watched superman media in the last 40 years. You are arguing for some hyperbolic interpretation of the character you picked up in your readings and proclaiming any deviation or deconstruction of that is beyond acceptable. Superman being a great man is more along the lines of 'definitive', him being perfect is an idea a handful of books may have broached upon.
For example. If you ask anyone aware of comic book fiction right now if a character like Captain America steals, they will probably all agree that he wouldn't. He's an honest 'boy scout', if you will. That being that, the reaction to cap stealing a car in this last movie, given given the dire and immediate circumstance seems wholly accepted and even endearing. That is people are going with it. I didn't see him ask the owner nor did I see him return it(I think I saw it destroyed). Now if we were to apply your hyperbolic prerogative to this exact situation: "The definitive Steve Rogers is supposed to be a role model and inspiration for all of us. The term super soldier, like man of tmr means he's perfect. Having him steal the car like that wasn't super or honest, it was a deviation of the character. I'm better than that so how am I supposed to look up to cap. The point of Dr. Erskine was to choose a good man, this isn't a good man, so they crapped all over that Dr characters entire point. Now cap is like every other cool character.....and on and on."
And you would go on to defend all that by again citing the definitive version of the character is a Boy Scout, and doesn't steal. The first problem with this is your use of the word definitive. Clearly the character has more than one interpretation(see the popular Ultimates). The second problem is that you have no appreciation for circumstance. What a character does is 100% dictated by the circumstance, how he/reactions is characterization. That's why Rogers can unenthusiastically steal a car when the fate of the world is at stake. That's why superman can take steal clothes that one time or a life and not make a John McClane like quip after the fact but rather shed a few tears. The film provides a circumstantial for every decision they give him.
Secondly, even if you were arguing about the definitive interpretation of the character(you're not imo), there is a greater discussion between definitive and 'best'. See my avy for example.
I'm well aware that DC is ashamed of Superman and has been trying to move him into a cooler, edgier character for quite some time.
I'm also aware that different people can have differing views. Someone who read the original Superman comics saw him torture people for answers...and they would certainly be baffled at the idea that he is a "Boy Scout." However, IN MY VIEW, the Superman character was NAILED when they created the Big Blue Boy Scout concept. He is the first and best, everyone else is in awe of him (even the people who think he's a chump)...he's the man who sees things from an angle no one else sees, and we can only hope to someday be as good as him. DC has been trying to move away from that, and in my opinion, that makes Superman pretty much like every character on the stands.
I actually don't view Cap as a boy scout. For years, whenever I read Cap comics, it seemed like a desperate attempt to make him like Superman. That never rang true to me, since he's a soldier. Cap should have no problem shooting someone in the head. However, as I mentioned, I think it's also a valid take on the character to be an "America Rules!" type propaganda character. What you CAN'T do with Captain America is make him a communist or something...because it is against what that character MUST stand for to be that character.
So...Space Ghost claims I can only see one direction, when in fact I see two very different directions for Captain America.
But as I said before...is it "acceptable" to have a Tarzan that was not raised by apes, and in fact grew up in the city in an upper middle class family, and he is actually an attorney that defends the environment? No, because we all know what Tarzan is. Is it acceptable to have a Batman whose parents didn't die and maybe they werent even rich, so he fights crime as a middle class vigilante (and has no aversion to guns)? No, that is not acceptable because that isn't Batman. In my OPINION, changing the Kents to be morally conflicted...and having Superman "born" to be a hero like Jor-el was born to be a scientist, is screwing with a vital element of the character.
In fact, I'll go one further...
Part of what makes Superman special is that he is the Last Son of Krypton. That, to me, is VITAL. When you throw in Supergirl, Superboy, Supercat, Supermonkey, Kandor etc etc etc, I think it takes away an important element from him (something DC repeatedly does out of laziness). It makes him commonplace. It's like with Flash...what's so great about being the Fastest Man Alive when there are 5 or 6 people who can make that claim??? Publishers (and movie makers) should identify exactly what it is about the characters that make them special, and embrace those things. The fact that Superman flies and punches things does not make him special.
I keep hearing these arguments making the claim that Superman doesn't have to be unique...doesn't have to be any different from any other character...and I can't wrap my head around why I should be reading comics about a thousand characters that are all interchangeable.
I do understand that I am in the minority though. People don't like the old fashioned Superman anymore.