I understand your disappointment but I cant say I fully agree, especially at the "insulted" part which I believe you said it sarcastically more, rather than literally. But you can be sure a lot of people considered MGS2 "insulting"" believing that this was the final Metal Gear and they now have to make sense of it, when the game left almost everything completely vague in its ending. Not until MGS3 and MGS4 were released, was until MGS2 became to make sense and earn the respect and the approval of a lot of people who hated the game before.
While MGSV is certainly not as complex and confusing as MGS2 was, it was never supposed to be confusing. It cant be confusing, the period in which the game takes place doesnt give much room for Kojima to offer something like MGS2 as far as the topic we are discussing. MGSV didnt aim to confuse, imho it aimed at completing a full circle and what I liked about MGSV is that it has ripple effects towards the entire saga and characters in various ways. You come out of MGSV and you now realise in a sense what really went on with Big Boss and Venom Snake. Who was the villain and who died, how he ended up with 2 fortresses, how he came back to life and how operation intrude came to be.
You come off MGSV and you get a new perspective of the characters you met throughout the saga and the opinion you had about them. You get a sense of how much Hal was similar, yet different to his rather asshole dad. His acts in all previous MGS become even more heroic after you see what his father was.
You see how Ocelot's loyalty to Big Boss had him starting to mess with hypnosis and all that stuff to convince himself that Venom is BB and then become liquid through the same operation.
Or how Zero got sick and even then tried as hell to keep BB alive because he still believed he can mend his relationship with him.
And then there is Miller and the other characters that had ripple effects throught the series.
Apart from mission 51 the game imho does a good job of tying things up.
Yes the presentation lacks, and the pacing is really bad. But I believe this was inevitable due to the mission structured gameplay decision that Kojima made at the beginning. And yes tapes are the new codec and while it is a lot of times boring, it does offer a lot of important story info.
My point is I get the disappointment and the frustration, but I believe most of it is coming from the initial explosion. Once the dust settles in, and people start watching what each game does for the entirety of the story we call MGS saga, they will perhaps appreciate it more for what it is, and not for what people hoped or wanted it to be. Just like MGS2.
One thing I really appreciated in MGSV is the way the plot twist incorporates the player into the Saga by breaking the 4th wall. Its not like I wasnt expecting the twist. But the way it was handled, I appreciated it, hearing Kojima in a sense telling me that I am a part of MGS Saga and thanking me for all the years we were together on this trip. It was a glimpse of his genius, to me.
Am I fully happy with MGSV narrative? No, of course not, in fact I have a lot of objections myself and I enjoyed other MGS games more than V in terms of story. And certainly this is not some grade A writing, but it is not the "trash" people make it sound to be either. The core of its story fits, makes sense concerning the timeline, ties up quite a few things that were forever remaining a mystery and provides a decent send off by saying a big thank you Valkyre/Big Boss.
PS: Something that I type after every MGS is finished. This game, like MGS4 and all other MGS games established beforehand, really exposes Solid Snake as the ultimate Snake. As the one who didnt succumb to his genes, memes and vengeance. He was the weakest Snake genetically, but the strongest in heart and spirit. He was the one who suffered the accumulation of what his father/brothers had to suffer, and yet he was the one to keep going forward, to remain pure, to keep fighting not for his ego or personal goal, but the greater good. MGSV like all previous MGS games is , in a meta-way, an ode to Solid Snake. The best of them all.
Edit: for a few typos and the PS.