At a previous employer, every time there was an 'honest' review from someone (something I could confirm happened, and usually recognized who it was), it would quickly be drowned out by 5-10 fake reviews that were somehow placed there by HR and their recruiting team. I'm not sure if they paid people to leave fake ones, or if they used some sort of service.
I have given up on using glassdoor, I put its ratings somewhere between Amazon and Ebay Seller ratings
I don't work there anymore. I left that company for a literal 100% pay raise, their pay sucks that bad. I wouldn't really pay attention to the glassdoor, though the negative reviews are very close to my experience there. Lack of direction and poor management. Their technology honestly sucks. Its an insanely political place where if you don't toe the company line and say everything is peachy, they force you out. Like even pointing out serious weaknesses in applications or the absurdity of a project is seen as being a problem employee.
There aren't very many smart engineers working there honestly. One of the good things there is that they put junior engineers in charge of projects, which lets them grow faster than most places, but the problem is that they put a bunch of junior engineers in charge of projects so there is noone who really understands software engineering and could actually mentor others. Like if a senior engineering resume came to me from RV, I would treat it as a Junior engineer.
So fine place to start your career, terrible place to actually learn how to build good software.
I just realized that you shared the UK link for glassdoor. Honestly, I can't speak for the UK office, they seemed fine. I worked out of their LA office, so maybe your millage may vary?
I apologize for any amount I may have contributed to your negative perception of RV. I don't mean to overly defend the company I don't work for anymore, but I did respect many individuals with whom I was able to work. Unfortunately they are under the Jeffrey Hammerbacher curve in their output.
I have given up on using glassdoor, I put its ratings somewhere between Amazon and Ebay Seller ratings