I'll echo the accolades this game has received by saying that so far it is damn fine.
I'm still in the summer portion, but I think I'm nearing the end of it. That sequence where
you're hanging upside down and have to protect Ellie
was damn intense, and had my bf (who was watching on the other side of the couch) glued to the screen. Even he was on the edge of his seat.
I love the little bits of detail they have added to make the world feel alive. For example, I go examine a secret area, and either Ellie or Joel will comment about the action, with either Ellie questioning what Joel is doing or Joel giving Ellie a heads up about where he is going. In most games, Ellie would just plod along, not saying a thing when you are clearly not heading down the correct direction, but Naughty Dog took steps to help ensure the game's suspension of disbelief is not broken. Little additions like this make the game world come alive and feel like a true cinematic experience.
It's definitely not perfect. Outside of the aforementioned graphical glitches, the enemy AI can sometimes leave something to be desired. In one of the beginning parts with Tess I saw her run right in front of a patrolling enemy and not get sighted. Thankfully it's not a recurring problem; I've had Ellie get noticed by enemies by being within their line of sight, so the ally characters aren't exempt.
Every game has problems however, and I certainly didn't expect it to be flawless. I'm really loving it so far.