I will allow Tony's placement of Loki ahead of Kingpin, but I still have to go with Kingpin as #1 in my list. Loki may be evil, and even fun to watch and hate, but Kingpin is the walking/talking definition of villain in my book. Here is my list:
I definitely agree with you on Spider-Island, but Spider-verse has been a huge disappointment. The writing has been mediocre, and the art absolutely wretched. With the characters in Spider-verse, that comic should be a slam-dunk for any writer, but it's clearly been a struggle for Costa.