I would have to say yes they are fully qualified personal whom have had to pass every test on products they support. In addition some are required to complete full technical courses so they may resolve issues quicker. There are 2 levels one consumer and the second is business level. In addition to the above they also must maintain the level by completing on going coarses. Outside of the Apple Stores where Apple distribute products through other retailers like Best Buy, USA , The Good Guys, Australia etc staff can do the training and achieve Apple Product Professional level which is the highest available. By the end off the year this will be a mandatory requirment if one is to sell Apple products. Again additional technical courses are available as needed.
The service provided by Apple is number one world wide and one should appreciate the system in place and the staff whom provide the support. My advice just go to an Apple store spend a couple of hours and watch and learn what goes on. Maybe then you will understand the level of requirement that I mentioned above.