Unfortunately, a majority of flight instructors are just as interested in building time as they are concerned about providing quality instruction. Some only care about building time.
As flight schools got busier and CFI’s became more valuable it got tougher to screen out the bad instructors.
Some of those “only here to build time” flight instructors have prob existed at every busy flight school. That may be reflected in the reviews. You’ll prob also see a lot of negative reviews about how it’s too expensive. That’s also true everywhere.