This. I have stuck with Elder Scrolls game because of the unique lore, and if they're going to toss it out for some grimdark fantasy clichés, I'll be extremely disappointed.
I'm in the same boat.
I realize that the Elder Scrolls has had differing accounts and such, but there's a difference.
Take Morrowind for example. A lot of the Tribunal books? Total bull****. The difference? The game provides you with a counter-perspective. There's the BS perspective and then there's the TRUE perspective. The game simply shows you both, and by showing you both, it sends the message of "one of these guys is lying." Even if the game never blatantly says WHO is lying, it at least confirms one of them is.
This? How is this different? We never had a counter-perspective on the Volkihar. That's what makes this a retcon. We were told what they act like and now we have something completely different.
And more importantly, it's just a poor decision. They've sold out an original idea for a cliché one, while simultaneously shoe-horning in some other Gamejam content that may not make sense (the undead horse, the vampire lords), some that's unbalanced (mounted combat) and some that doesn't even feel like it was beta tested. (magic kill cams, sometimes arrow kill cams too)
This sends the message of "we just don't give a damn." Of course, people who treated TES like a book are upset. Imagine watching your favorite movie or TV show, then right at the climix they say "yknow what we stopped giving a damn, now we're interested in this story about vampires instead, so here's a completely different story with vampires."
One, yeah, it's disappointing and borderline insulting, and two it sends the message of
this could happen again at any time. Let's say these Dawnguard turn out to be extremely loved. The Dawnguard vampire hunters are well-written and loved by 90% of the community and hailed as the greatest faction to enter TES since -insert popular faction here-. Part of my complaint is that, come TES VI, the very people defending Skyrim now? You might be in my shoes. You might be complaining that your favorite group from Skyrim got retconned and completely written out or changed ENTIRELY. Maybe in TES VI, the Dawnguard are suddenly dead without a trace (after Skyrim establishes them as a Tamriel-wide faction), or now their main focus is to hunt Daedra.
Hence I speak out. I'm sick of this attitude where names and faces change on a dime and we're all supposed to be perfectly ok with this. No, that's called bad writing: learn to write.