For example, in DC Heroes, the first game to use MEGS, Superman's strength is several orders of magnitude more than Batman's.
So, while Superman would still have a clear advantage in a brawl, Batman is at least able to hold out for a while, mirroring how superhero combat often operates in comic books.
MEGS was originally developed for the company Mayfair Games for the modern superhero RPG DC Heroes.
The system was heavily modified for Mayfair's cyberpunk war veteran RPG Underground.
Indeed, even negative APs/Units still represent positive values, though exponentially smaller, down to -100 APs, which is defined as absolute zero for all units.