the reliability of a centerfire primer is a lot better than a rimfire round also
That should be expanded with the concept of "You get what you pay for."
rimfire ammunition is no less reliable than centerfire ammunition. And it is, arguably, less prone to manufacturing mistakes, due to its simpler design.
But, the cheap bulk packs at WalMart? Yea... "quality" is not the appropriate word to describe that ammunition. It is 'bargain' priced for a reason.