Chams are relatively more intense to care for compared to other herps. They need daily attention unlike snakes, need complicated watering unlike most ground dwelling lizards. You can't just take a weekend off due to their need for sprayed water. Their housing needs to be fairly complicated due to live plants, screening, size, control of bacteria, etc. Actually, to bird keepers they would seem "normal". So many of the horror stories still exist though, due to really poor care info being given out from petshops where newbies first see a cham. Their nutritional needs are complicated by the need for correct lighting, and we still don't really understand all this. Most chams kept over the years were wc and arrived stressed, seriously dehydrated, full of parasites, and simply being unable or unwilling to adjust to captive life. You can still hear the horror stories, as newbies still end up making the same mistakes, but some stories are not as common these days. There are several good websites now and some decent recent books. Good sites include:
http://www.chameleonnews.com
http://www.adcham.com
http://www.chameleonjournals.com
http://www.calumma.com