Quoted from vid1900:No it's a sign of great design.
Comet was the first game designed so the ball would violently hit the glass, surprising players still to this day.
Comet made insane money on route, and thus Williams sold 8,000 of them.
Whitewater was another game where the ball regularly hits the glass. It added to the reward of hitting the longest (at the time) ramp in pinball.
Williams sold 7,000 of those.
any stand up target, middle PF in front of the flippers can be made into an airball target. Just bend the mount bracket to give it some angle and then the ball can ramp up off of it.
Think Bally Bow and Arrow and hitting the roving 5000 shot =D CRACK