The guy was smart, charismatic, detail-oriented and driven. I'm kind of a nerd for serial killers/criminals and Bundy is one of the most complex and fascinating.
Some did wild stuff but weren't real deep - Ed Gein. Some were incredibly intelligent and meticulous but their body count wasn't real high - Ted Kaczynski. Bundy's damage, I think, matched his capabilities and talents. Knowing what we do about his victims, and that there is more we don't know, he seems to be one who lived up to his criminal potential.
I now feel renewed sadness for his victims and their families. Also if you're looking for an actor who is a spot on match to portray him, Efron is definitely your guy.....