Well, I had German EPAs (Ein Mann Pakete), and US MREs.
Personally: Eating both transports enough chemicals into your body to make, in the event of death, beeing deposited on a chemical waste dump a certainity.
The German stuff has some very nice (and shit reducing) chocalate, okish bread, some sausage (which tasted a bit weird), and a fairly tasty cheese like matter.
At the worst, it tasted like nothing, which is better than MRE taste.
I would give EPA a 5, and concerning MREs I would have to definie negative numbers.