I truly think Halo should've progressed down a path of faster movement speed and better default maneuverability around the maps. So additions like the Thrusters could have a place in default Halo settings IMO as it doesn't drastically break map movement, but offers more advanced alternatives.
I like Thruster Pack because it does offer improved movement in some situations. Dropping down a ledge faster, altering your projection while under the effect of a gravity lift/man cannon and of course that small boost of speed in a direction.
I'd see that it had no longer got that silly 1 second move into 3rd person though. I'd like to see how it would work if a player could still aim and shoot during the thrust.