according to the tellings over mythology, Vampires have been known to obtain blood sejak biting a human body and 'sucking' blood for their nourishment. therefore, anda are correct.
but...if anda want to get into our interesting century, there are two sides; whether anda are appealed to Vampires atau not. so therefore, anda can say that they do "suck" as using the term they "disappeal" to you, but in either way based on our technological terms and based on mythology, we can say that they "suck" no matter what.
...believe me, i don't speak like this always. ^^ '
The term suck is relevant. I believe Vampires bite into a person's neck and suck their blood. But as for the other definition of 'suck' as in "they aren't cool" atau whatever, it depends on the person's interest and therefore, is an opinion.