Then there's the pant-wetting boss battles of the old games. All the more scary because you can't just avoid them. They have to be defeated. Aiming is a bitch, sometimes even seeing where you're going/the location of the boss is a hazard in itself. We came to love these elements, but we've forgotten about how they made the game. All those things are core to a horror film, as well. An assailant who cannot be seen, protagonists who can't aim for shit, etc.
Even with the scarcity of ammo, gimme RE5 perspective/controls/etc in RE1 and I'll breeze through it, headshots all the way. Thus diminishing the horror-factor. For me, Resident Evil (as a storyline) ceases to exist after Nemesis (or at an absolute stretch - CODE: Veronica). The storyline just got ridiculous, it wasn't scary anymore, etc.
For my money, you only need to look at the title to see RE6 isn't going to be all-conquering. It's a story-based franchise that hasn't had any good story for the last three major instalments. It's reached it's sixth instalment, and third pointless-one-in-a-row as far as the storyline is concerned. I bet it ends with a cliffhanger for RE7.
That's not to say it's a bad game, I would just personally call it a bad Resident Evil game. But that's because I have a very set image in my mind when I think of RE, and ever since RE4 the games haven't matched the image or the certain kind of 'experience' that I expect.
The nearest any post-fixed camera angle/tank controls RE got to horror was one of the canned version of RE4, dubbed the 'Hook Man' version, which I'm sure you've all seen by now.
In my opinion, all these other ones could have just as easily been different IPs about zombies. Still, gotta love cash cows.