I noticed my CTR is down because of the new link ad unit format.
I don’t know about other ad sizes/types, but if you see your link ad units, there is quite a big heading mentioning “Sponsored Links” such as below. Before few days, this wasn’t a case with my link ad units. Of course it is perfectly fine mentioning it as “Sponsored Links”, but it doesn’t make much sense because Link Units are two step Ads. This now reduces chances of clicks on the very first page itself.
This new experiment by AdSense is turning into a disaster.