I bought chicks from Poultry Hollow a few months ago. I was inside the brooder house and there wasn't a bad odor - just normal chicken yard odors.  It was a rainy day, too - and usually that kind of weather would make any odor more noticeable.   I didn't pay attention to whether or not different colors of a breed were penned together since that's not my interest.  I noticed the pens with a few chickens in them - but they weren't over-crowded.  As we walked among the brooders, everything was well kept - and the chicks were healthy and thriving.  I got chicks from several different brooders - so we walked the length of the brooder area and back.   I am very pleased with the chicks I got from them, and the people were helpful and friendly.  No, it's not a high-tech fancy hatchery, but there was no mismanagement of the poultry that I observed.
 
There are several threads about Poultry Hollow with both pro and con comments.  I would definitely buy from them again based on my personal experience and observation. Sorry your experience wasn't a positive one.  The chicks you got sure look healthy, though.