Ant Man was also horribly marketed. I think GotG got better marketing.
Also laughing at DC comics. Batman's been their best property by and large because he's the easiest to give depth to. He has motivation. Flash follows ironically in a close second, Barry being relatable as someone who was human and (until recently) unmarked by tragedy. Green Lantern got a decent personality upgrade post-Crisis, but Geoff Johns really rounded out the character and the other people who also carried the title like Stewart and Rayner.
Superman's a blank slate. He's supposed to represent All American Values and the Boy Scout. He's not allowed to have opinions and values that might be controversial (and considering that he was raised by two Kansas farmers, what would his values be?) Which is why it generally seemed uncharacteristic of him to kill someone. Ironically, he won't be on trial for that (tho I guess who could blame him), just all the other stuff that wasn't his fault directly. Tho movies and film like to make it like he's an alien first and Clark Kent second, when the character probably had the best runs when he was Clark and not Kal El.
Wonder Woman's anachronistic. Her conception was for a "strong, independent woman" in a time that it was out of the ordinary. That reflected up through her first post-Crisis run. Sadly, her characterization has always been inconsistent. At times, she's portrayed as aggressive and overly militant, which interestingly conflicts with her "bring peace to man's world" ambassadorial mission, or treated as some sort of soothsayer.
More modern depictions of her have played up the aggressive, almost war-mongering side of her. For instance, in the JLA Tower of Babel arc, her weakness was her drive and in a virtual reality where she couldn't beat her opponent, she would keep fighting until her heart gave out. Cutting Superman's throat when he was under Max Lord's mind control and kicking the crap out of her and then snapping Max Lord's neck to free Superman from his mind control. Or Kingdom Come, where she overcompensates (as Batman observes) for being banished from Paradise Island for failing to "bring peace to man's world" by enforcing peace militantly, even killing those who aren't stepping in line. At war with Atlantis (taking over Europe IIRC) in Flashpoint. Or the Injustice comic where she saddles up to Superman post-Lois-killed-by-Joker and encourages his authoritarian takeover.
Also remember the entire point of her choice as ambassador (in the versions where she doesn't just run away with Amazonian bracelets) is not because she any special qualities to her character, but because she beat the asses of every other person looking to become the pick to go represent the Amazons.