Interesting collection in that DC doesn't usually publish a collection of a title that was a reprint title to begin with. Most of the stories are from the golden age of comics (1938-1955), with a few silver age stories thrown in.
When I first began reading comics in the '70s, DC (and Marvel, too, I believe) had several reprint titles. WANTED: THE WORLD'S MOST DANGEROUS VILLAINS was one of those titles. I never had a complete run, though, and reading this collection allowed me to read several stories I've never had the chance to read. The Doll Man and Kid Eternity stories, in particular, were fun reads, since in the 1940s and '50s those features were published by Quality Comics, a competitor of DC at the time. DC bought those characters -- and others, including Plastic Man, Blackhawk, et al. -- in 1956.
Recommended.