I think the difference in opinion is like Tallgeese said, its movement based and some people are fine with that, but I would like to use the Thruster and Jet Pack in more of an Assault kinda of style. Especially the Thruster Pack, in its form now its more geared toward Dodging a rocket, Grenade, Ghost, and maybe Melee sort of Deffensive/Movement where as I heard about it and thought, ' thatd be sick in a one on one BR fight, people dodging back and forth to get the last Headshot.'
I also agree with RYU HAYABUSA, that its redundant to just make the Jetpack a Vertical boost because the controller scheme would make it hard to go Upwards with the Thruster Pack on.
I liked REACH's Jetpack and the only thing I wanted to see changed about it was faster Lift capabilities and only thought it was overpowered when someone had a Rocket with it, much like the Sword and Sprint.