Carl's Jr has the crappiest "meat" in the industry. It's always very dry, with a texture that approaches dried play-dough. The buns also suck too. I don't eat much fast food, but CJ is definitely the worst of the worst.
I'll just leave this here: http://aht.seriouseats.com/archives/...eseburger.html
Comments at the bottom are useful too.
Moar
http://www.laweekly.com/restaurants/...es-you-4670354
http://tomsfoodieblog.com/fast-food-...he-verdict-is/