The most USELESS monster.

The most USELESS monster is the one that no one builds, and minotaurs are exactly like that...

If you're evaluating based on outposts, then why didn't you mention Hydras? No one ever builds Hydras. But evaluating them like that is still wrong. As for the Minotaur, its ability triggers 2-3 times per battle, and if it triggers more often, that's even better :) By the way, their damage is quite decent; they're a good offensive unit at the beginning, especially if you support them with magic and other warriors. You just don't know how to use them properly.

no, there won't be 32 monsters... 15-20

15 of them are gathered in 2 months... If these are champions, then you can easily gather 32.

and Gas triggers after 30 Medusas, 99% of the time

Gas depends not only on the Medusas themselves but also on the unit you're attacking with the Medusas.

you can clear the entire map in 3 weeks with just Efreeti

O_O Teach me, Sensei :D Especially how you use Efreeti to break through levels 3-4 of neutral creatures.