Reddit mentions of Vicious (Villains)

Vicious

Cape High

a light read but still very good, it alternate between characters each book, but still maintain a overall plot

The Indestructibles

really nice too

Kid Sensation

Rise of the Renegade X

Please don't tell my parents i'm a supervillain

Wearing the Cape

Meta

Vicious

I'll just throw in there are actually quite a few book series that focus on superheros, but aren't adaptions.

George R.R. Martin edits a series called Wild Cards which he refers to as mosaic novels. He and his friends will right a series of short stories which fit into a novel, each novel is part of a trilogy, and each trilogy is part of the larger world. The series has been going on since the 80's. The first one Wildcards was recently republished with added material. If you want to skip forward though Inside Straight was written to be a good jumping on point.

Brandon Sanderson recently wrote a series called The Reckoners , where people with Superpowers have taken over the world and

I haven't read these, but Vicious is supposed to be really good as well. Ex-Heroes is massup of the Superhero and zombie genres, I can't speak to it's quality, but it's fairly successful.

I know it isn't exactly what you're looking for, but I thought these might interest you.

Edit: Oh, and if you are interested in the Wildcards series, I would highly suggest reading the first novel even if you skip forward afterwards. The first book is essentially a series of short stories that tell the history of the Wildcards from their appearance in the 40's to the 80's when the rest start taking place.