And, now I'm not talking about the multiplayer. I did never really play Uncharted for that, because it's all about the characters from my perspective.
I wouldn't really mind if Naughty Dog just made another Uncharted game without multiplayer and used the same engine, grapichs and all that, just a new story with new locations, and I would be happy.
Uncharted: Great story, good gameplay, kindof repetetive with all the shooting.
Uncharted 2: Incredible story, awesome gameplay, just a little repetetive with shooting but not much at all.
Uncharted 3: Great story, not as good as Uncharted 2's story though. The gameplay of Uncharted 3 is the best, it has the best mechanics and most variety.
Uncharted 4: If it happens, it will be awesome, nuf said.
For Uncharted 4, I think they should add like Rika Raja, or maybe Marisa Chase from Golden Abyss. Tenzin returning would be awesome, but that is highly unlikely.
Environment: Drake has been to jungles, mountains and deserts. Also like destroyed cities and shipwrecks. The environment there are left is like forest, more cities, swamps...
And gameplay: I know its alot of climbing already, but I really enjoy just climbing and ''making'' new paths...