Oh man, the Master wants to get rid of all things that make humanity's life so miserable. But thing is will life under the Master going to be so fantastic. Vampires need blood to survive, and after turning most of the people to the tentacle monsters, there's not going to be life, but the end of life on Earth.
But it is nothing compared to the revelation that Quilan's father is the Master. The whole thing of being born out from turned mother boggles my mind. It is something I cannot comprehend completely, but I accept it being possible in the realms of fantasy. After all Quinlan is not the first half vampire in human mythology and I doubt he'll be the last.
Still, to live thousands of years to commit a suicide to save people that aren't his is so unbelievable. Not even ST:V's Seven of Nine dreamed about being able wipe out all Borgs from universe. Then again you look Gus's madness on trying to save his mum, and you start to think should the humanity just let it go and accept their fate under Master's rule, especially as he seems to be invulnerable to even to a decapitation by a silver sword.