Because it was awful.
The armour looked stupid and then to actually have a camera inside the fishbowl head piece to show Jamie freaking out and sweating to the point he should be concerned about drowning... Icky.
Besides, Booster was acting far too capable to be truly Boostery.
There's a Guy on You Tube who did a whole bunch of JLI short movies. They nailed Booster and...
A Question mystery movie where he's trying to figure out who killed Blue Beetle.