I've been working for Rev since September 2019, and although I've been happy overall, there are some things that I hope will improve in the future.
I recently completed a video where the last 7 minutes appeared as completely blank for me in the caption editor. No sound, nothing. So, I did as I was told and added no captions for the blank part. My grades for the video got rated 1/1/1 (The lowest possible) and I was told my account will be closed in 120 days if I do not improve. I contacted support because this was honestly not an error on my behalf, but they just told me "last 7 minutes not captioned, grading is fair". This made me very sad because I truly find this job important, and I always do my best. I'm proud of the fact that I offer a quality service to this company. I didn't need to be beaten down over something that wasn't my fault. Getting fired is something I fear every day.
I don't think the grading system is unfair in general, but the people grading the jobs often don't do much effort and make mistakes themselves.
If I could give advice to rookies joining Rev, don't worry too much if you're cutting it close with deadlines, you'll get better as you become used to the style guide and such. At the start, I took almost an hour to caption 5 minutes of video, now I can do it in less than 20 minuts.
Although I have many complaints, I have yet to find a more reliable company offering caption jobs online.