The Genius Bar people are cool. Some of them are not. Those that are not are usually pompous as*holes. Those that act like this are either: working at Apple for a paycheck or simply think they are above anyone else.
The really good Geniuses are those that work at Apple because of the conviction they have in Apple and the brand it represents and because they want everyone (like them) to have an always positive experience with their Apple product.
I have found also AppleCare over the phone 10x better than a Genius Bar, but that still doesn't mean you don't find nice Geniuses all around. I had one Genius give me an extra discount on my Al MacBook the day I bought it because I was sick (flu) and asked for the student discount (I had my student ID ready to be shown).