Ruined? No. Temporarily tainted their image as a teenage girl's self-insert fantasy thing? Ehhh, for a little while, yes, but I think that effect is already starting to fade. Even I have gotten a Twilight comparison, and the abusive aspects of Daniel and Christine's relationship aren't romanticized, it's just straight-up abusive. XD
If there's anything that annoys me when Twilight is brought up it's the "stalking" and "old vampire targets very young girls" thing. Um, since when are vampires NOT depicted as stalkers? Also, Dracula and like a billion other vampire stories have an older vampire targeting a young human woman, why do people act like Twilight invented this? XD
Vampire stories have been around a long time and will probably always be there in some form or another. There will also always be readers for the genre, too, so never worry about that, and there will always be silly people who immediately make a comparison to other media, whether the author wants to hear it or not.
If you, or anyone here's curious, I wrote this BIG article a little while ago over at my Tumblr about what I learned from writing vampires over the years (because Daniel isn't my first, it's just the first I didn't reboot like three times XD), I also just try to give a whole lot of tips to people who are considering writing a vampire story -
http://vermillionworks.tumblr.com/post/133561128067/writing-vampires
The best thing you can do when making a vampire story is just single out your favorite vampire tropes and go with the flow, and also remember that not everyone is going to like them, just like everyone doesn't like werewolves and zombies. However, as @bumblegoo said, there is no real way to write vampires. If someone wants to make them get chicken pox from sunlight, then that is entirely up to them. It's their story.