Destiny Tracker doesn't have a stat for "kills per super activation" which would be the most illuminating stat in regards to how "OP" HoS is. I disagree with the neutral game assessment. I've always found invis 100% worthless against skilled players. The only things they have are blink which is not nearly as effective as it used to be, and quickdraw (or whatever it's called). About the only viable grenade they have any more is the sticky due to the arc bolt nerf. The range on blink strike is really nice though, and you can either have it always up or abuse how broken backstab is for a 1 hit from nearly any direction. Sunbreakers have incendiary grenades which are amazing if you're good with them, and a sticky to choose if you're not. The burn on the melee is really nice and lasts a long time and with stoke the forge it's always up. Cauterize also triggers on grenade and melee kills which is awesome. Blade dancer probably has a little better neutral game overall, but not by much. Sunbreakers have a lot stronger neutral game than most give them credit for, the only thing they lack is melee range. my personal favorite for pvp is defender, but I'm definitely running sunbreaker for anything competitive.