I received a lot of sales from Google Merchant Center, and ranked very well there for years. Over the past few months I've noticed a substantial drop in clicks as well as a drop in rankings.
I've gone through every item and fixed any errors, and have added all of the new required tags, such as shipping weight, Google Product Category, etc.
Panda was bad enough when it killed my organic search traffic. If it's now screwing up the Merchant Center results, then I may as well kiss all Google traffic goodbye.