I've had private guides in Egypt, Jordan, Thailand, Vietnam, Bali and other Asian countries. 99% were totally enthusiastic and loved their country and it showed in how they explained everything. We didn't really like the Jordan guide/driver for some reason. He was boring and didn't really explain much. We did do 1 private tour in America many years ago. That ended badly with me asking to be returned to the hotel as this wasn't what I had paid for. The driver then came in to the hotel foyer yelling that Australians were cheaters and rip people off!