[saumil07]

It's interesting to note that across 165 comments, only 2-3 have even touched upon Quality Score let alone attempted to discuss it in detail.

Based upon personal experience (worked at a company that spent 8 digits on Google Ads on an annualized basis, profitably and successfully over a long period of time) I can assure you that Quality Score does NOT mean very little.

It is also a falsehood to state that Quality Score is entirely about "how a site looks". Google actually even measures how quickly users come back to Google after clicking on an Ad - and if users come back too often in too short a period of time (signal for poor quality ad landing page), the advertiser's Quality Score can be penalized (to what extent, exactly, is of course unclear).