Only watched it a couple of times.  I have no doubt that he's knowledgeable, but his attitudes were sometimes hard to take.  She puts up with a lot!  On the positive side though - it was a good personal reminder for me to be very careful with my spoken language when dealing with family members (or other people) in a real survival situation.  It's so easy to come off as being condescending - but that's not good.
One reason why I like Bear Grylls is that he has a tremendously positive attitude and a fair degree of humility.  I really don't know if he's like that in real life, but I wouldn't be surprised if he is.  It's an admirable quality - hard to achieve!
other Pete