Going to go ahead and mirror thoughts I've seen expressed elsewhere: even as someone who's generally enjoyed superhero movies over recent years, Wonder Woman reminded me what it was like for a superhero to actually inspire you. I loved her so much.
1). She was human. This partly came through Gal Gadot's portrayal, such as during the ridiculously charming boat scene. It also came through, though, during Diana's moments of conflict. When she turned her judgment on Steve, she showed a sort of vulnerability you don't often see in these kind of movies. The kind where a superhero is showed to actually have realistic flaws, which don't necessarily express themselves in a way that make them seem especially strong, cool, or whatever else. Feeling lost and frustrated, she briefly, harshly, unjustifiably turned on one of the movie's most likable characters. That was a brave choice on the part of the filmmakers.
Also, it was nice to watch a superhero fall in love in a way that felt organic. This part worked so well largely thanks to Chris Pine, whose Steve was certainly someone I could imagine Wonder Woman falling for.
2). She was unreservedly idealistic. Wonder Woman actually stood for something meaningful, and because she was allowed to do so with complete, uninterrupted sincerity, she also came to represent something meaningful. Her sense of justice, her unwillingness to let circumstance shrink her, her belief in love. . . This was a superhero movie where the supervillain felt unnecessary, because the mundane world was already a perfect foil for Diana's heroism and virtue. She spoke to something real, beautiful, and all too rare.
3). She was powerful. Partly because the movie nailed the above two things, this part of the superhero fantasy was depicted in a uniquely impactful way. Look at the No Man's Land scene as a reference. She was a very human character, so when she was out there alone, absorbing this barrage of bullets, we sympathized with her; she was heroic, so when she stepped onto the battlefield, she represented a sort of justice that was missing from the world; and finally, because she was powerful, we knew she could make a difference.
And yeah, it was just amazing and so cathartic watching a woman kick so much ass.
I can't say for sure that Wonder Woman is my favorite superhero movie, but she's certainly become my favorite superhero. It's not even a contest right now. Aside from being incredibly likable, badass, etc., she actually embodies something I feel is worth striving for. She's an icon that can be looked to for strength and inspiration, and is the first superhero in awhile that is actually worth holding in reverence. Honestly, Wonder Woman didn't only remind me what it's like for a superhero to inspire you; it also reminded me that superheroes have something to contribute to the world.