I thought Abby's build made sense. She's out for revenge, and is paramilitary trained (twice over by both the fireflies and the WLF), and in one of the few groups where access to gym equipment and food needed to have that build exist. Knowing her motivations, it makes sense for her to try and get any kind of one up that she could.
Unless you are playing Ellie like a madman, she is not meant to overpower people.
TLOU2 wasn't a bad game, it lacks the spark of what made the first game great imo, but it still remains a solid 8/10. Even if you don't like the story, the world building remains top notch as does the music and gameplay. It's always going to suffer from what Alien 3 did, but I ended up liking that film, just like I did this game.