I hear this a lot that he was good in defence. He may have been of course, but defence isn't really a standout quality I look for in a fly-half. I want them to create tries, score a few themselves etc. He only got 6 tries I think in 91 games, which is pretty poor.
That's not to take away from the guy. His dedication and approach to the game put many others to shame, and you get the feeling he made the most of what he had, I just think the media have over-egged his standing in the game because he was an excellent goal kicker.