The game tries to make you feel empathy for Abby. The problem is that OG players are so invested in Joel and Ellie, it fails in doing so for a lot of people and most people just are not able to forgive Abby for what she did just because we played as her for a few hours. We had a massive journey through a whole game with Joel and Ellie with 7 years to let it sink in, compared to just a few hours with Abby and like 10 minutes with her dad. I see what they were trying to do but it just wasn't plausible to make everyone feel connected to Abby in such a short amount of time, especially when most of the game was you trying to get revenge on her with Ellie
I could understand Abby's point of view and they got close to making me feel sorry for her, but still, in a lot of people's eyes including mine, it was still fukk Abby and I wish I could have killed her. That's why the ending felt terrible to me at first and why it's getting hate from some people.
Even though it's not the outcome I personally wanted at the time, that doesn't necessarily make the ending bad. You have to put biases aside and look at the story as a whole from both sides. Now I've fully calmed down and reflected on the experience, it was an amazing game.
A lot of people saying this doesn't have replayability and I agreed at first, but I think a second playthrough will let them take in the story from both sides instead of being full of vengeance and bloodlust. I'm definitely going to play through parts 1 and 2 again eventually and I hope they release an Abby DLC.