I can't say I understand much why the legions of Star Wars LEGO fans enjoy LEGO Jango Fett as much as they do other than that it is so difficult to come across this minifigure.  The LEGO Jango Fett's Slave I 7153 is a fairly rare find so this might be part of the reason.

Jango Fett's Slave I

LEGO Jango Fett is only included in this particular LEGO set.  This set also includes LEGO Jango Fett's son, Boba Fett.  The ship included is one of the cooler Star Wars ships, even in the actual movies.  It has a tendency to break in a few places but other than that it makes a great display piece.

SLAVE 1JANGO FETTBOBA FETTSTAR WARSLEGO7144 7153    US $66.00

Lego Star Wars 8011 Jango Fett Technic 100 complete with instructions    US $13.00

Lego Star Wars Jango Fett minifigure with jetpack helmet blaster minifig legos    US $1.25

LEGO Jango Fett is a bounty hunter and, in particular scene he is depicted in with this LEGO set, he happens to still have his head.  He was decapitated in later movies.  His son, Boba Fett, is actually a clone of Jango Fett.  LEGO Jango Fett has a helmet in the Slave I LEGO Set and also a detachable hair piece.