For some of my recent airline flights it's been quite noticeable that the pilots weren't quite sure what to do with the rudder. I'd assumed it was due to a lack of basic flying skills, but perhaps they were all ex-glider pilots.
That said, I'd wager that your glider-pilot acquaintance learned what to do or not to do with the rudder sooner or later, but that he at least knew how to fly, which a number of recent accidents have shown is something not all pilots are able to do.
Last edited by abgd; 30th November 2015 at 21:36.