Our family rented a vehicle from Dollar when we visited Costa Rica back in 2021. The vehicle was exactly what you might expect in Central America - but good enough. The rental location was a few miles off-airport and the shuttle drivers were courteous.
The costs were double due to the lost damage waiver and other coverages that I purchased. Not knowing the terrain and roads very well I opted to pay rather than risk an accident. We went to some crazy places and road conditions were rough in a number of places. The highway down to the resort - near Jaco - was pretty good , but some twisty two lane roads made it interesting. A few places - a bit off the beaten path - had one lanes, pot holed gravel roads, and poorly marked roads. GPS is so helpful.
I can’t recall all of the rules, but the list of things I could be charged for due to damage caused me to buy all the extras. The rental office lays it on thick - enough to make me purchase (and I never purchase when I’m renting in the states). Thankfully, for my families safety nothing happened while driving.