Best game ever, yes there was one mechanical flaw in game play I noticed. Once an NPC vanished while I was targeting them and guess what? I don't care.
This game is the best because it is raw emotion. It explores grey morality like no other contemporary story has. They used their ability to make you empathize with new characters in a way that was successfully jarring. I started in one place emotionally and ended in the opposite. It was only a "slap in the face to fans of the original" if they are incapable of evolving emotionally and are attached to their ideas of the original cast. The first one is my second favorite game, only beat by this one because it challenged my ability to feel. Naughty Dog is good because they are willing to do something different, change our expectations AND especially because their stories are driven by emotions. If you are looking for more of the same story, you will hate it. If you are looking to feel struck deeply by something, you will love it.
Naughty Dog, please give us more of Abby and Lev.