Every new GS has had 'dubious build quality' including the 1150's failing gearboxes, rear wheel bearings, poor fuel injection, corrosion issues etc whether real or imagined - it is the nature of internet forums to make mountains out of mole hills, mostly without any real statistical evidence. If you were to believe all this crap then you'd never buy anything.
Whilst i agree that forums tend to over blow things a little
I challenge you on the dubious build quality of every BMW bike tho as my 1200 Twinky has been faultless in every respect since bought new in August 2012. Everything as it should be straight from the stealers ( i have changed the shockers and been re mapped but for preference not neccesity)