Sometimes I think there wouldn't be so much controversy over the evolution of RE if the series had remained "Biohazard" in the west.
The original Biohazard is a spooky zombie horror game... for the first half of the game.
The entire twist of Biohazard is that the gothic horror theme gives way to industrial technology and viral mutation themes. It does remain "survival" oriented, but it's not "horror".
But "Resident Evil" sounds like a horror movie title.
The joke, from my point of view, is that after the first half of the original game, the series evolved and diverged constantly! RE2 was a disaster in the city scenario. RE3 was an escape from New York scenario. Code Veronica was actually the precursor to where the series was going... it was mostly about exploring the bizarre world of Umbrella conspiracy, unraveling a mystery, and fighting bizarre bio-engineered monsters.
RE4 was more about tension and survival, with a sense of dread in some places. And it was mostly about mutant monsters, not zombies.
RE5 was an action style game, and once again, it was about tracking down a conspiracy in progress to stop the outbreak of more bioengineered monsters and viruses.
RE6, based on the trailer, seems to take this all to its logical conclusion.
Sometimes, it sure feels as if American RE fans are a bit like N64 era Zelda fans. Their perception of what the series even is, is permanently colored by the very first game they played, and it is not taken into account how the series has changed with every entry. It has never been the same.
At any rate, RE6 just looks as if it'll be a multifaceted game with a lot more content than RE5. I still suspect it's because it didn't have as troubled a dev cycle as RE5. Perhaps its what they intended RE5 to be in the first place.