But I loved the gameplay there. You're constantly on the move, you're firing while hanging all over the environment, the encounters are varied, and it was one of the most gameplay-focused sections of the entire series.
I can totally see why some people would love that section for just the reason you said - "one of the most gameplay-focused sections." However, I think that also shows the difference between those people and me. :)
I am just a person that mostly plays games for story and to experience the different worlds, locations, and characters. While I don't like games to be so easy I'm bored, I'll admit that the perfect difficulty for me is a game where I can complete everything the first time with only a small amount of difficulty. I do enjoy intuitive puzzles, because they make me think, but when it comes to difficult gameplay, whether it's platforming or shooting, I can get frustrated pretty easy. I just don't like those things slowing me down for the real reason I'm playing the game.
The one that sticks out in my mind is an area where Drake specifically mentions doing everything all quiet, but there's dudes positioned around the room so you have to get into a gunfight no matter what.
I do like stealth games quite a lot, and I will play any game stealthy, if it gives me the option. One thing that has frustrated me in every Uncharted game is exactly what you pointed out... The game will act like a section can be completed in a stealthy manner, but it actually makes it impossible...or so close to impossible and so easy to not play stealth that I just feel there is bad design.