Processed cheese is not cheese. It's rubber that won't hold air. It's cheese product. The only acceptable use for processed cheese slices is throwing at your little brother. I wouldn't even feed those to a dog.
Kraft’s Deli-style is pretty good, too (comes in a pre-sliced block, like what restaurants use for burgers). Just don’t get the Kraft singles, which aren’t nearly as good in flavor or consistency.