I'm a fan (and you should be too) because... If you've ever had a hard time in your life, Gavins music, somehow, always has a way in which it can cheer you up.. The lyrics incorperated in his songs are truely heartfelt (even I have to admit this (18yo guy) and yet dont care for some sterotypical view of how I shouldnt, because anyone would agree that the songs are).
Gavins voice is also unique and perfectly fits to his songs, showing his emotion clearly..
Finally, his live performances of his songs are almost as if they were being played fom a cd, it takes true talent to live up to what is heard from the studio in front of a live audience