I know for UC1 2 and 3, you could shoot an enemy about 5 times. but they'd still be alive. I don't really like uncharted at all, so I didn't bother picking up 4.

I think it is better than Uncharted 1.

I'm confused about the "whack-a-mole" complaint.
This is what most AI programmers go for in terms of realism.

The alternative is guys who run at you without pause for their own safety, which is very unrealistic. Creating diversions for an enemy is good programming.

I can quite agree.

The problem is not about the games being too difficult. The problem is about unbalanced difficulty, often raised with cheap and unfair ways: like bullet sponges, one-shot kills, etc.
Not that it matters too much though, since the game has checkpoints around every corner. The fact that you can die at any moment without the risk to lose any progress didn't even compell me to play it much seriously.

I can't tell about UC4 or Golden Abyss but any Ps3 entry has this kind of problems.

The levels aren't open as in open world, it's still guiding you along a path, it's no more open than a typical Halo game.

And I have spent enough cash on the franchise, maybe in a few years when I can pick up a PS4 and Uncharted 4 for next to nothing.
I get why people love it though and that's fantastic, but for me as a gamer it just doesn't hit the right spot, it was one of the reasons I purchased a PS3 though, that and the PS3 was the best Blu ray player money could buy for years.

Those events were stupidly predictable. You *knew* something was going to happen, 9 times out of 10 you would get it right, movies that do predictable "events" would also get an eye roll out of me. :P

If you say any Uncharted game is too hard, then I don't think you really know what hard is. Definitely on Crushing difficulty I had some places where I died a lot and got pretty frustrated, but that's exactly what I was expecting by putting it to Crushing difficulty setting. If I want a play through where I don't die much I play it on normal. I usually play most games on normal first time through, but because I found UC 1 pretty easy on normal I decided to play UC2 and 3 on hard first run through, and I didn't die as often as I thought I might.