That's odd. I assumed Sylvanas Fanboys were largely in the camp of "They ruined the character", and would be in your camp.
Honestly, and I've said this before, but it feels like most human brains just aren't build for the MMORPG formula. Where the world, story and characters keep updating.
It's probably nostalgia-based to some degree. But it's probably also because we're used to other genre's where past content remains equally valid. Like, the Harry Potter books are not equally liked. But later worse parts does not disrupt enjoyment of the earlier parts. She same goes for Marvel movies. You can pick up any of your old favorites again, and find them static and unchanging. That's not the case with an MMO. 95% of an MMO is the latest chapter. It be like only the last book or movie now being relevant. So rather than add to the whole, the new thing is now mostly the whole, with the past content being the addition. So we're confronted constantly with a changed setting, changed characters, expanded world.
In the end, I don't think a reboot that tosses all that out will be the solution either. For soon people will feel the same way about the new stuff coming out for the reboot, and nostalgia will set in for what they've abandoned.