Two games come to mind for me. They aren’t as underrated as some of the games being mentioned, but are overshadowed by other Bally/Williams games of the time. Those games are No Fear, and Dirty Harry.
No Fear keeps me coming back with the speed and the addicting jump shot. Idk why more people don’t talk about this shot, it may just be one of the best in pinball. Also the triple wizard mode at the end is pretty cool.
Dirty Harry is just a super solid game overall that seems to take a backseat to other very similar games. The side ramp on this game is super smooth and satisfying, and the modes are engaging enough. Fun multiball mode too.