I can hit 5 shots off the top flipper on NGG: targets above slam ramp, left ramp, putting green, Bud, and Buzz. Agree that JP's upper flipper is well used. MSF's upper flipper is used to hit multiple letter targets, the sarcophagus, and loop to ice cave. Spiderman's upper flipper is mostly to hit the Venom ramp, but you can also reach Sandman, Doc Oc, and Green Goblin targets from it.