You honestly think it's good?
1) open with this brother tries to set the stage for the twist but you can see it coming a mile away, no set up, not nearly enough exposition between the disconnect between the brothers
Actually, i think the point is to get the long lost relative trope out of the way. In fact the proper reveal of the game introduced the brother trope "hello little brother, i almost shot your head off", or something to that effect. I never saw
coming, it was a good twist. Everyone knew he was going to be betrayed at some point by his brother, but the twist is they did not know exactly how.
2) you might actually believe drake keeping Elana out of the loop if you hadn't played any of the previous games
Because he was keeping her out of the loop. This story is a self-contained story that does not rely on knowing the previous games. Yet is perfectly believable that while Drake was hunting for treasures, he had a brother who he thought was dead.
3) goofy game mechanics to set up the finale (I need to save my brother but you can't come with me why)
Because i made a promise (lied) to leave this dangerous world behind and i don't want to tell you the truth. And it is a familiar "doing this for your own good" trope.
4) ham fisted Disney ending, a giant fuck you to any notion of redemption
It is a simple happily ever after ending, same as the previous Uncharted games. Nothing wrong with that.
5) no magical or spiritual enemies or continuity from previous games in this regard
And that's another thing i like about it. It was a different tone than previous uncharted games.
I could go on and on, uc4 was a huge disappointment in storytelling. It's clear there were two directions the game was going and in the end it just felt so disjointed or disconnected