As someone that mains reaper in CC, I honestly think reaper is one of those classes that really depends on your team and how competent they are. I always play reaper as the backline harasser. Those ranged DPS casting or shooting with impunity while the rest rumble on the point? Yeah it's my job to take care of those, and if not my job is to help someone else who's focusing a target (you're rewarded for this too with immortal sacrifice stacks).

I find that Reapers LB is weird, but it edges over into being good because they gain it so fast-- to the point where I'm entirely comfortable solo LBing someone just to ensure they die. A good reaper will know when to go in and when to cut their losses, made easy with how hell's ingress functions. I'm constantly capping out my immortal sacrifice stacks before my next plentiful harvest is off cooldown, and when it's off I make sure Im buffed with arcane crest and I debuff with death penalty which QUICKLY stacks damage for the debuff to hit them with. I've killed so many people who think they outheal me and death penalty hits them with another 20k, meanwhile I get more LB charge.

If there is an *annoyance* though, it is chasing down a target with hysteria. You have to kinda position your LB in such a way that your main target hits a wall so it's easier to chase them down.