You are gloriously backtracking so hard.
Friendly reminding you.
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Lol you gave the point yourself. "Can be used in any situation that needs his class" is Gellius's weak point, like the archer gif. He's not universally useful, he's useful in specific situations, just like you were (wrongly) criticizing Nadia for. Nadia on the other hand is useful in a lot more situations, either as a tank, rush unit, or dps. In all these situations she is individually strong, but she's even better in that she can perform all three, while Gellius can only perform 1. So no, Gellius is not "universally good", that's Nadia. He's the situational one, not her.