Whoa, whoa. I didn't write that Naughty Dog didn't invest any time developing the gameplay in Uncharted 4, or that it's uninteresting. I said that the gameplay is uneven and the production values are all-time great. If the gamplay was also all-time great, the game would be unstoppable.
Don't get me wrong. I enjoyed Uncharted 4 a lot. But I think you'll agree that Naughty Dog invested as much time and resources crafting a story and creating an engine as it did inventing interesting gameplay scenarios. I mean, that's what people expect from Uncharted.
The problem here is that movies and video games demand different things, and they don't always make good bedfellows. Naughty Dog is probably the best in the industry at weaving the two media together, but even they can't negotiate the difference every time. When a sequence unfolds according to a rigid script, it takes away from the agency of the player, which diminishes the gameplay possibilities.
Now, in terms of mechanics, you're right. Uncharted 4 is great. Shooting, moving, and climbing is all much improved since Drake's Deception. But gameplay is more than just mechanics. It's about how the player interacts with and experiences those mechanics.
Well you said "If Naughty Dog spent the same energy crafting interesting and involving gameplay, the game would be unstoppable".
And what I'm saying is that they've done that at least within the realm of possibilities. What you seem more troubled by are pacing issues. The balance between gameplay sections and cutscenes/walking sections. That's another issue. What I responded to was what you quoted from his review ("If Uncharted 4 played even half as good as it looked, it would be a masterpiece…"). He's strictly talking about gameplay here. And I don't think it's true that the game plays less than half as good as it looked for the reasons I gave.