I wanted to choose some hybrid class firstly, but I rolled hunter because of its features and mechanics.
I rolled Mage based solely on the human Mage in the original intro cinematic, throwing fireballs off that tower/hill (whatever it was). That was so epic to me at the time and the "vibe" of the Mage class has kept me intrigued ever since.
Nope, I just play whatever I like to play. Though playing a pure dps class is a bit less annoying. No need to carry four sets of gear (druids :c ) which is amazing.