IMO - most people only post bad reviews. Someone who is pleased with the outcome is lounging in the pool.
Some people do make an effort to post good reviews so you have to balance what the issues are in the review vs just the rating.
Pools, houses, outside kitchens, etc all have challenges and would not expect any to go 100% smooth.
I would focus on how the pool builder recovered from the mishap rather than just the mishap.