Well, when i meant the score MGS 4 received was fair..., i meant it was fair in 2008 when it launched, when it was rated. MGS 4 is my least favorite main MGS game too. MGS 4 had an interesting story, a funny villain and gorgeous moments, fantastic audiovisuals at the time and it was pure nostalgia for fans that played and loved the saga. It was what it was, good and bad, but mostly good.
As for MGS V. Ocelot acts the way it does in MGS V because he is not 18 years old anymore like he was in MGS 3. He is close to 40 right now. You have to take into account that in MGS1, MGS2, MGS3 and MGS4 he was a double and triple agent at time doing an act. in MGS V he probably is the most honest version of him, a matured and more calmed version of a Snake fanboy, that like to interrogate people in its free time....XD.
As for Quiet and that puddle. By the time you have that scene, you must have played a lot of missions together to reach that affinity level. Quiet and Snake had already a good chemistry since they met in that duel in Afghanistan, so i don't see the problem here. The subtle relation between both during the game was one of the best things of the game in my opinion, and it made their last mission a sad one. Despite all of that, an awful story has not avoided multitude of games to have 90+ metacritic countless times (i see Devil May Cry, Bayonetta, etc as examples), so because of that MGS V should not be penalised either too.
So despite all those (reasonable and fair) critics about those games, MGS 4 was a legit 9/10 game in 2008 and MGS V was a legit game 9/10 in 2015, in my opinion of course .