With female characters "bitchy" is often synonymous with "strong".
If she's consistently deferring her desires to cater to his and she's sweet and polite while doing so that would be interpreted as another case of a woman being submissive to a man and feminist would have a problem with it. Pick your poison.
That sounds good and I'd like to see that, but the issue with this is that Superman's flaws are cherished while Wonder Woman's flaws are not.
Superman's flaws are that he lets his compassion cloud his judgement, too trusting, naive, etc. Wonder Woman's flaws are that she's impatient, overly violent, willing to kill, etc.
So, when it comes time for the couple to learn from each other guess who needs enlightenment? Bingo. There have been opportunities for Superman to learn from her but because writers find his flaws endearing they don't capitalize on it.
For example, when trying to decide whether or not to kill Doomsday Superman didn't consult her at all. Why not? That would have been a golden opportunity for writers to have her teach him that compassion taken to ridiculous extremes is not necessarily a good thing.
Even this issue, she told him why stopping in the middle of battle to build a wall that would fail was a terrible idea but Superman wouldn't listen to her because emotionally he couldn't handle the truth. That horrible idea was never portrayed as something he should learn from in the future. He never acknowledged that she was right, just dug in his heels and said "Well, I don't agree.".
Wondy has her flaws but when she is right the writers need to actually portray her as such and not shy away from it because they dislike her side of the coin.
I'd like to see that as well, but at the same time he can't adjust to her lifestyle if she doesn't invite him into her life.
Superman took her to that dinner in Smallville, he gave her a key to the Fortress of Solitude, a key to his apartment, taught her his kryptonian language and gave her a kryptonian gift. (plant/pet)
Wonder Woman is severely lacking in this department and considering the rather intense hatred her sisters have for men I don't blame her for not wanting to subject him to the joys of amazonian culture back home. But that's not Superman's fault either.