from what I gather talking to instructors, it's the new questions that lack the quality control. What's strange is that it doesn't appear to be that dramatic in all subjects. There are some that are more affected by bad questions than others. For example I haven't heard a single peep about Gen Nav despite it having some new questions added recently.
Instruments seem fine as well - except I heard that helicopter exam had a question about synchroscopes and N1, which I bet can be very frustrating