You understand this game is a power fantasy type game right? so why are you trying to limit the power fantasy? you compared nyx's ability to contol ONE enemy at a time vs revenant's ability to control a large quantity, without mentioning nyx has an even stronger immortality ability than revenant, but you aren't called for that to be nerfed??? Reave doesn't just restore health and shields either, it has a decently fast travel time and strips armour. In addition to this, reave converts all enemies stunned with mesmer skin into thralls. The only real points you've made is that thrall damage is lacking, and the pillars aren't very effective, in addition to a (very) lacklustre passive ability.