Google Ads graders like WordStream's Performance Grader measure proxy metrics such as Quality Score, CTR benchmarks, and ad strength, none of which reliably predict business revenue. A high grader score can accompany a failing account, and a low score can signal a profitable one. This article breaks down exactly what graders score, why those scores mislead advertisers, and which metrics actually predict performance: CPA relative to your business economics, revenue attribution from click to closed deal, and impression share on intent-rich queries.
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