I booked a car at Barcelona a few years ago through Goldcar, then read the reviews and feared the worst.
We got to the off site pick up place and queued for nearly 3 hours to get the car. While the desk workers buggered off for lunch.
They tried to get us to pay for extra insurances but I just said no to everything. including the additional ‘not having to get the car checked over on return fee’.
Took the car back 2 weeks later and pulled into the car park, place was empty, pulled into a space next to the building and a guy that helped us find the car 2 weeks ago came over to us, took the keys and helped us with our bags onto the mini bus to the airport.
Never heard another thing from them. I think I got lucky!