From Michael Stebbins, CEO of Market Motive in the “Learning To Love Your Quality Score” session at PubCon:
For e-commerce advertisers, instead of deep linking your paid search ads, take visitors to the homepage and dynamically adjust the content of the page to match what they had searched for (within the homepage’s look and feel). You gain the trust imparted by the homepage, provide highly relevant content to the Google AdWords bots, and still provide a solid user experience to your visitors.
This can also be done using referring URLs for organic search.
This idea doesn’t directly impact Quality Score, but the homepage is a more trusted page for users. If you’re not Amazon, taking someone right to a purchase page is a bit, well, forward. Use a custom homepage to build trust.
Your web development team should be able to implement this.