I've ordered from Murray McMurray twice. Both I experienced casualties, but most were not because of the hatchery. (or so I think. . . .)
If you just want layers, sure, you'll get that. Most of my birds started at 7 months, no matter what breed. (although I never bought layer breeds. . . I got dual purpose and ornamentals)
If you want something more than that; Rare breeds, ornamentals, show birds, birds that look like they're supposed to, birds that are purebred: Their Aruacana/Americanas are of course Easter Eggers, a mutt chicken. No hatchery sells Araucanas. Their Brahmas tend to be crossed with Sussex, probably to increase egg laying and growth. Their Wyandottes look typical hatchery. They're very hardy though. And so forth. . . They're okay but remember that Murray McMurray is a very old hatchery, so their stock is most likely very old and possibly inbred. I say possibly because I have no solid proof and don't want to start an argument.
Infact, in a short story, if you want to see what these breeds look like from Murray McMurray, just ask me for photos:
Brahmas
Turkens (naked necks)
Easter Eggers (advertised as Araucanas)
Crested Polish (silver laced and white crested black)
Silver Laced Wyandottes
New Hampshire Reds