Yes, it is possible to get good Adwords quality score on squeeze pages, although it is harder than content pages. Keep an eye on the keyword density, meta of the page. Those are the few things you want to look out for. Go for 100% relevancy and you might score a 10/10 on your keyword in the quality score.
I hear many pros say you can't make it with just a landing page any more. You need a landing SITE with some content, a privacy policy, about us page and contact us page.