Ancient Mesopotamian isn’t a language. Rather, it’s an amalgamation of various cultural groups across a specific geographical region who spoke (and wrote in) a variety of languages — Sumerian, Semitic dialects, Akkadian, etc. In fact Sumerian itself may be just an off-shoot of ancient Dravidian languages from what is today southern India. So it’s a little bit like saying “as comprehensible as African.”
FACT: Ancient Mesopotamian languages were every bit as comprehensible as rap to most Ancient Mesopotamians until the 2200s B.C.E., when Sargon the Great made everyone convert to a uniform, syllabic Akkadian script
When Sargon was an infant, his single mother couldn’t raise him. So she put him in a reed basket and floated the little man down the river, where he was discovered and subsequently raised by a woman who found him while drawing water. Sound familiar?