If I may...
Not everyone who has a following is a hero, plenty of villians have followings.
Fett is more of an anti-hero, much like the Punisher. If you are willing to accept the expanded universe Fett becomes the leader of the Mandalorians, he acrues a mass ammount of respect, and he is revered as one of if not the most dangerous men in the galaxy.
He is a hero in that:
He devoted a great many resources to stabilizing the planet Mandalore after the Yuzzhan Vong. And he has a great many attributes to be admired, which is part of being a hero.
He holds himself to a personal standard that he never deviates from no matter how tempted he might be.
He is a BAMF
He is not a hero in that:
He is not motivated by a greater cause, but rather money.
He is technically a mercenary.
He has no alter ego. (Like Clark Kent, or Bruce Wayne)
However the Fett is not the sort of character you can truly compare to any one. He is unique. He is... Well he is the Fett.
"Everyone dies. It is the final and only lasting justice."