Saw this reply while browsing through reddit which ı agree with. These are some of my reasons why re5 and re6 have the best stories of the franchise imo.
" RE5 and RE6 storywise are arguably the most Resident Evil Resident Evil titles around and expanded upon plotlines that were either hinted at in games or reserved for supporting material.
1. RE5's eugenics reveal about Umbrella's true goal was hinted at for years, and was to be revealed back in Stylish, the game that became Devil May Cry. They just replaced Tony Redgrave with Wesker.
2. The Ndipaya plotline was itself recycled from "Castle", with an ancient civilisation ruled by an ancient Progenitor-infected superhuman king. In RE5, the Ndipaya are expanded upon as creating monsters with Progenitor (read: B.O.W.s), and ultimately being wiped out in an outbreak when the monsters escaped, thus giving us a disturbing exploration of the inevitability of bio-weaponry. Picture Chris' opening "more and more I find myself wondering if this is all worth fighting for" when he learns about *that*.
3. RE6 confirmed why the US government bombed Raccoon City, then forced the President's resignation in covering it up. Turns out it wasn't to stop the infection spreading at all, since we knew since RE2 that beyond the Mountains is tens of miles of empty Plains. The revelation is that the government blew up the city to prevent the Chinese getting hold of footage of B.O.W.s, which would have given them ideas in how their own B.O.W. project should progress.
4. RE6 also answered whether or not the government is still making B.O.W.s as hinted in their need for Sherry. Turns out no, they definitely did disavow, them, but The Family is essentially doing the work for them as a private entity all as part of a nationalist endeavour to beat the Chinese. This is essentially a repeat of Wesker's Report II's wink-wink-nudge-nudge that Umbrella was making B.O.W.s for the US military as a way of circumventing the Bio Weapons Convention to beat the Soviets. The political themes in RE have always been there, even before RE5's "terrorists love selling to Africa rebels" idea - they just weren't put on the spotlight so we were easy to not notice. "