Cliff and Sam and the whole last two hours saved the game for me. The game was falling apart and the Amelie beach sequence in particular I would pin as the worst thing Kojima has done. Conversely, Cliff's death and the "Last delivery" are some of Kojima's best. I viewed Cliff as a stand in for Big Boss/MGS as a whole and that metaphor came to fruition really nicely in his death scene
I also really liked how the ending really recontextualized the UCA and the Chiral Network as being abuses of connectivity much like social media and affirmed that inter-personal, chosen (rather thane enforced like the chiral network) connections are most important.