>>283437977
The Shiki's only real power is the one to control the mind of the people they suck the blood to (along with seeing better in the darkness), other than that they're normal humans strength wise, and they're also limited by their weakness to sun and the fact they cannot enter a home without being invited first (hence why they use the mind control technique). They were so successful at the begininng because
1) they attacked a secluded villaged with little contact with the outside, so they could operate without the intervention of the exterior
2) they attacked people who were alone by surprise during the night when they can see better
3) people didn't believe in their existence until based doctor exposed Lady Gaga Shiki with Natsuno's help
4) they were hard carried by Tatsumi who's the superior Shiki specimen
Take those advantages out of them and ultimately they're just pitiful vampiric corpses