I think they purposely made vampire attacks extra lethal to mess with the whiny brats that constantly complained how every npc should be killable, or at least a majority of them, despite their connection to quests

And of course now we have complaints even for that

A good feature that add immersion and thrill ? Good,but make it less annoying please or i disinstall the dlc

To the op: i had some broken quest , you know what i'm done ?
I've started a new character once the patches were out and played them without problems

You can't blame bethesda for your own faults,laziness and lack of patience - reload a previous save if you have it and you've done

if you don't have it well....read above