Not as much as a lot of players say she is,but Navi still manages to hit the spot.I once played the game,and was on my way to the Hyrule Castle.I almost got there,and then she starts her notorious:"Hey!Listen!",so I press the C^ to see what does she want to say,and she says:"Link,you should go to the Hyrule Castle!"
If only you knew how pissed I got at that moment!