Uncharted 2 is still my favorite overall. BUT, Uncharted 4 does so many things in such an amazing way that it's right up there too.
They tried too hard to wrap the series up with U4. All the homages to previous entries and to previous ND games, all the references and stuff... It's a full on FEELS trip. And that makes it a bit weird.
The more mature tone, the lack of a kinda supernatural twist at the end (I was waiting for pirate ghosts or immortal pirates or something), the slower pace, the brother's flashbacks and so on.
It all made it way too emotional and full of FEELS, way too much for an Uncharted game.
I'm pretty sure they would've done something a lot more bombastic if they didn't wanted to give these characters the phenomenal send off we've seen at the epilogue.
U2 = U4
U3
U1
Gotta play Golden Abbys sometime next month. For what I've seen it's Uncharted 0.5
Ps: I feel really sad knowing that the next ND game may very well be over 2 years away.