NPC allies are exceptionally useless, often not being able to defeat even a singular equivalent opponent when ganging on such with superior numbers.
Alternate name: Useless NPC allies
The first video game about Useless allies was released in 2005.
This can usually seen by stopping fighting, finding cover, and observing the allies fighting. In some games this causes a stalemate where neither side progresses, in other games the enemies actually start winning. In worst instances the allies just die off without even single enemy defeated.
See also: one of many