I could never stand the trial lessons I flew with whose first line was "I've got x thousand hours on FS2000/2/4" (indicates how long I instructed full time for). They would sit and stare at the instruments for the whole of an hour long detail whilst I was trying to point out the beautiful Kent countryside (Dartford, Gravesend, Chatham etc) and give headings to avoid the traffic I was hoping they would be looking for.
Similarly those students who used FS2000/2/4 to practice showed a marked deterioration in their visual nav but could track a VOR to within 8/10ths of an angstrom, of course they couldn't do that and hold an altitude because the FS2000/2/4 autopilot can't either.