No Offer Visible On Landing Page
This goes in line with pricing (point 6) in that if you promise something in your ad, then you should deliver on that promise quickly and without too many roadblocks. Make it difficult then you may notice higher CPCs, little traffic or no traffic at all.
What you can do to fix it:
Ensure your ‘offer’ is in a readabe text form, otherwise it may go unnoticed and your Quality score will remain low.