Jeep Rear End

They are not "junk" as literally millions have been used over time in various applications. When used in their element, they are good rear axles. It's a Dana. Dana/Spicer doesn't make junk.

Put in the wrong application, such as a vehicle with a lot of bottom end torque capable of hard launches and they are not a good match.

That does not make them junk. It shows the user has poor judgment.