Taste and quality aside... no argument there.
You must have seen the "undestroyable" McDonald's hamburger making its rounds on the Internet recently.
Did the story seem uhm... rotten a bit?
It probably is.
Here are a few good places to see if your average burger should really "decompose":
Some Skeptical Clarity to the Unrottable McDonald’s Burger Videos/Photos - via Science-Based Parenting
The Burger “Experiments” - via Neurologica Blog