Iv been enjoying reading the above posts and can only describe my opinions on reaper from what I have experienced as a DPS main.
Since the buff I have had issues countering him and keeping him off my tanks and due to the buff, there is always a reaper in the opposite team now. Does this mean he is broken, or does it mean I need to switch and learn to counter him better. Who knows?
I can feel the fear from most main tanks when he gets close but work together, get that communication up and he will be down in seconds. (Might take 1 of you with him haha).
It’s a team game, remember that. I found that to be my best counter.