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Mighty Gorgons drain life if the last unit of the enemy stack has less than 50% health (I think it's like that). ... 20 gorgons take out 1-2 own dragons + deadly gaze, totaling 2-3 dragons per attack.
Mighty Gorgons drain life regardless of the amount of health of the last unit in the enemy stack. By definition, each MG in your stack has a 10% chance to kill one opponent unit in addition to the direct damage that will be dealt by the entire stack...
Regarding direct damage from gorgons... 20 gorgons won't take out even one own dragon in a single hit, yet you say 1-2... How? (This refers to an encounter between opponents of equal strength). Obviously, if your hero is a tank and you encountered neutral dragons along the way, then perhaps even 10 gorgons would be more than enough.
