Completed a SP Level Cap Disruption with Soma Incarnon using Harrow yesterday. Harrow really fixes up the weak points of the gun by boosting the crit chance up a ton, as well as boosting fire rate which helps out the low status chance of the gun.
Worked really well with him, but I do agree that it is underwhelming in the majority of situations you use this gun, and with other warframes that aren't able to boost the crit chance greatly like Harrow.
https://streamable.com/vwhi9m
(Don't know how to copy and paste a video into the post on a phone, so here's a link of a clip of the run, might be the only level cap soma incarnon run at the moment? Couldn't find any on YouTube or anywhere else).