Elmofongo: Metal Gear Solid 5 is the best imo :)
Crosmando: Kojima has lost his mojo, he's like a movie director and when director's "lose it" they rarely ever make anything as good as the stuff they made in their creative prime.
I dunno, perhaps it was the way MGS4 felt "Westernized" (to be fair MGS3 showed signs of that too), maybe it was the overly long cinematics instead of long Codec dialogues like the previous games, but the game was a bomb imho. It lost all the camp and uniquely Japanese flair of the originals, MGS2 had such amazing writing and it was such a deconstruction in it's plot and themes. It was in a Western setting but it was unlike anything before.
Basically the decision of Kojima to give Hayter to boot and use Sutherland as Snake in the new game was the last nail in the coffin for me. The guy has obviously forgotten what made the original games decent, and now fancies himself a big-shot movie director.
I LIKIE WESTERNIZED MOVIE LIKE METAL GEARS!!!!
I am sorry but looking back Metal Gear Solid 2 was the weakest of the series, the acting was bad, its characters wer campy in a bad wa,y, Psycho Mantis, Sniper Wolf, Vulcan Raven are in a way more realistic than Vamp, Fortune, and Fatman :P
Besides I will always love the Big Boss Metal Gears despite some unrealistic things like The Pain who controls Hornets and The Fear who is a weird spiderman and Volgin who controls lightning.
Also Judging from MGS 5's trailer I expect someone like you to like the new gameplay additions they made:
More Stealth
Freedom such as hiding in a moving vehicle and driving a vehicle.
Open World
Better CQC
etc.
This is the opposite of games like Ryse and yet you are still dissipointed :(