That's because they were fucking amazing games. And this comes from a person who thinks MGS 4 suffered with the sames problems Death Strading does but in a even worse level: cheesy dialogues, messy script, stupid moments (I HATED AKIBA WITH A PASSION, almost ruined the game for me). But like Death Stranding too, when the story and characters work, they really really work, and make for some of the most memorable moments in gaming (everything Snake and Liquid related in that game was amazing and i loved it). That's what Kojima gives to you. I accept the bad if i get this level of good too.
As for MGS V, MGS V is another amazing game. Its gameplay is still unmatched in an open world/sandbox-stealh/action game. The amount of different aproaches/ways to play the game are masterfully crafted. Yes, the story is inconclusive and lacks any good direction for the most part, but still talks about interesting ideas like imperialism, pacifism, identity, family, treason, loyalty, etc....It's production values are top notch too and is still one of one of my most played games this gen. And what gives if it does not have a good story??. Zelda BOTW does not have a good story either and nobody cared and received a 97 on metacritic....In fact, because it was a Kojima game, I think MGS V was unfairly trated after launch just because it was not treated like a normal game.
As for the fact that those games received better scores than MGS 3, that probably happened because the original version of MGS 3 had that fixed camera from above a la MGS1-2 that made things way more difficult than necessary, a thing that was fixed with the Subsistance version. Oh, and by the way, MGS 3 is one of my top 5 games ever, with the best story Kojima has written by far. If MGS 4 and MGS V were 9/10 games (like Death Stranding) for me, MGS 3 (Subsistance version of course) is the pure definition of a 10/10.
Those games deserved the 90+ scores...They're classics, even with their faults. And Death Strading should have been treated the same way, i mean like a 90+ scored game.
Opinions are like...well, you know. Anyway, my brother and I started playing the Metal Gear series on the NES (based on the commercial, we thought it was gonna be another Commando/Ikari Warriors). We were surprised and hooked ever since.
MGS4 was the reason I purchased a PS3 and I was actually pretty underwhelmed. It still had some great moments but it just seemed to be missing so much that made 1-3 so epic. And it had too many terrible moments, imo.
I also bought MGS5 (both partss) at full price on day one and couldn't bring myself to finish it. This was the first time I'd never finished a Metal Gear. I still plan to one day but it's been how many years?
So I skipped this game. The only reason I'm even here is to see if people's personal experiences match the reviews.