The results are surprising, Quality Score and Cost Per Click are more clearly correlated when you look at Exact Match keywords.

Following a series of Adwords optimizations, we fixed the previous 6 agency's work which allowed the same budget to go 23.9x further.

The Google Quality Score is a vital diagnostic tool in Google Ads. It is based on "historical impressions for exact searches of your keyword." Google's Quality Score ranges on a scale from 1 to 10.