The ROI is quite disappointing. For the month of March, for every dollar we spent on adword, we get about 1.2 dollars back. Most of our sales still come from natural SERP and from people who type in our URL manually.
I am wondering what is the average visit duration, pageview, and conversion for your websites?
Of course, regarding ROI you should do something, and there are a few options (including lowering your bid). Try each one for a few days and carefully track your ROI.