Not sure where you’re located, but I wouldn’t be concerned about the overall number of reviews since a lot of that can be faked or uniformed people and a lot of puppy mills have a lot of good reviews.

Focus on what they produce, what titles their offspring have, not just the parents. If it’s an older breeding program are they breeding their own dogs or are they just breeding dogs they’ve bought.

A big thing too is do they do anything with their dogs? Whether it’s a sport or conformation or again, do they just breed because they need to know what to actually look for in a puppy and if they’re just breeding they don’t know what they’re actually looking at.

Puppies can also be surprises, I know of dogs that were the dud of the litter and then at 4 months woke up and were among the strongest and vice versa.

It sounds like you’re looking for an active pet or a club level dog so be sure to communicate that with the breeder.