I think reaper could use some minor potency buffs to keep up with the other classes. It does feel a bit low when I am for example soloing glamour runs, my bard clears those a lot faster. But overall I think it is well balanced.

The only thing I dislike is that on older content say lvl 50 roulette stuff.. You have like 5 buttons to use... Your 10% debuff, the 1-2-3 combo slice and the blood stalk thing. While the 1-2-3 combo is very, very slow. There is not much else to do. Sit around and wait for your GCD's. Not really something to weave in the rotation. This gets boring real quick. Reaper starts at level 70. So baseline should be all the level 70 skills in my opinion. Which gives you the gibbets and gallows for you to weave in and master. Other classes that start at a higher level should have that as a baseline level aswel. Dumbing down to far is not really helping you with your rotation mastery.