5 Quality Score Mistakes That Are Costing You Money

Quality Score is Google Ads' report card on how well your keywords, ads, and landing pages match what searchers actually want. It is rated 1 to 10, and the difference between a 4 and an 8 can mean paying half the CPC for the same click. Yet most advertisers either ignore Quality Score entirely or optimize it the wrong way, leaving thousands of euros on the table every month.

After auditing hundreds of Google Ads accounts, we have identified five recurring mistakes that consistently drag Quality Scores down. These are not obscure edge cases — they affect the majority of accounts we see, from small businesses to mid-market companies spending five figures monthly. Here is what they are and exactly how to fix each one.

Mistake 1: Stuffing Too Many Keywords Into One Ad Group

This is the most common structural error in Google Ads. When an ad group contains 30, 50, or even 100 keywords with different search intents, it becomes impossible to write ad copy that is relevant to all of them. Google sees low relevance between the keyword and the ad, scores it as 'Below Average' on Ad Relevance, and your Quality Score drops.

For example, if your ad group contains 'buy running shoes', 'running shoe reviews', and 'running shoes near me', each query has a fundamentally different intent. The buyer wants a purchase page with pricing. The reviewer wants comparison content. The local searcher wants a store locator. One ad cannot serve all three.

How to fix it

• Limit each ad group to 5-15 keywords sharing a single, clear intent
• Split mixed-intent ad groups into separate groups with dedicated ad copy and landing pages
• Use the 'would one ad headline work for every keyword here?' test — if not, the group needs splitting
• After splitting, write new RSA headlines that include the target keyword and match the specific intent

Mistake 2: Ignoring Landing Page Experience

Many advertisers focus exclusively on ad copy while sending all traffic to a generic homepage or a catch-all product page. Google evaluates your landing page as one-third of the Quality Score calculation, checking for relevance to the keyword, page load speed, mobile-friendliness, and content quality. A generic landing page that does not match the specific keyword intent will score 'Below Average' every time.

We recently audited an account where the advertiser had excellent ad copy (QS component: Above Average) but was sending all traffic to the same homepage. Their landing page experience was 'Below Average' on 78% of keywords, keeping their average Quality Score at 4-5 despite strong ads. After creating intent-matched landing pages, Quality Score improved to 7-8 within three weeks.