Theres a lot of complaints ive seen as well over the difficulty. You can get through it on normal and hard but it gets very annoying. I played Uncharted 2 on all the difficulties and enjoyed it everytime. This one I had quite a few "Fuck This" moments and it was only until I decided I didnt care anymore and just wanted to see the story that I lowered the difficulty and started enjoying it a bit more.
Also, im sick of running towards the camera.
Also also, it feels like they wanted the melee combat to be like Batmans but didnt have the time to spend on it so we get a slowed down version with the same animations over and over.