but is there some criticism somewhere on it of the decision to declare a Mayday and RTB?
Although some posters may be interpreting the comments in that fashion, the "criticism" (discussion, I thought) shouldn't be focused on the decision to return and land, but rather on how the event progressed from the initial warning of avionics smoke to a deployment of the RAT -- i.e., --
Was the appropriate checklist followed precisely by the crew?
Was the checklist itself properly constructed?
Were other electrical/mechanical faults not apparent to the pilots?