You mean "HAH-dess." And yes, such hate is ridiculous for those who are familiar with the Greek god of the underworld (from those who take Greek history to those who only play God of War or watch the Disney movie or play Kingdom Hearts, the Japanese version of which also pronounces Hades's name as "HAH-dess" in Japanese but "HAY-deez" in English).
HAH-dess, sounds so much more better in my opinion, not because it's the japanese pronunciation, but it's sounds cool and it's different from the usual "HAY-deez". But knowing the way they've dealt with names such as
Erza going from "AIR-za" to "UR-za"
Lisanna going from "LEE-san-uh" to "LIZ-zan-uh" or "Liz-san-uh"
Lamia Scale "LAH-MIA" to "LAY-MIA"
x-x. I've already gotten over those, I'm just saying that they will most likely use the "HAY-deez", even though "HAH-dess" sounds so much cooler. xD