Defender was a support class like the sunslinger warlock. Bungie did away with support classes because they are idiots and in a YouTube video one of the main developers said us players were to stupid to make our own minds up on how to run a spec just because he didn't know how. All supers now on all characters are watered/dumbed down versions of what they were and all are the same but with different colors. U just thro shit across the map and kill stuff. No skill needed in PVP and especially PVE which was what the game was really meant to be in the begining. God forbid we have any individuality or want to run a character our own way. D2 ruined the RPG side of the game to cater to casual idiots and PVP tards.