it should be taken into account not only the confrontation of level 6 units with each other, but also with the rest...
Nagas are definitely in 2nd place with their life and retaliatory attack stats...
but the retaliatory attack is the main argument for why Nagas compete with Dark Knights...
and if you compare the retaliatory attack with the curse and double damage...
and let's assume that the battle takes place not 1 on 1, but wall against wall... the Nagas don't have many chances when the double damage skill is triggered...
it is optimal to compare the strength of units not individually, but during wall-to-wall battles.