I've literally never seen Blizz. Haven't played as much as most you guys, but never seen him (her?).
I rarely see him either. For my bounty hunter I alternate between Mako and Gault. I love leveling with Gault because if you have him attack first you can mow through some mobs. The higher level elites is when I bring the Mako out. And of course once I aquired HK he became my DPS companion.