This is the Epic 7 hero tier list for Global server. Keep in mind this is just an opinion and you must still make your own informed decision on whether you want to invest in the character or not.
The current characters are graded based on their performance on the following areas:
World - Adventure mode and farming
Abyss - How useful it is in some Abyss Floors
Raid - Endgame performance against various raid bosses (Arakahan, Karakanis, Vera, Queen etc.)
Boss Hunt - Whether it is useful for Wyvern, Golem or Banshee boss.
Arena - How useful it is in PvP (Cleave, Stall etc.)
Guild Wars - How good it is in offense.
We will be making changes in the future when patch updates happen.