Melee isn't awful for Challenge Modes; you are. Melee players are a liability for the windows of time in which a tank keeps an enemy mob faced towards them, resulting in an exorbitant loss of damage or death. Melee players are a liability for people who keep rooting mobs next to them. Melee are a liability to a healer that cannot heal.
clear your cache. honor pvp gear is still ilvl 458. if you remember your hp value from before you started seeing this graphic bug, it's still the same, because you didn't gain any stats and the gear is still the same client side. it's also the reason why you can't link the item in game: the epic honor pvp gear no longer exists, and its only the rare quality.