Rescue 911 - I never could get the helicopter to work properly even after rebuilding every part of it.
Alien Star - Boring layout, but apparently a shooter's game and loved by tournament players.
TSPP - Annoying callouts (and I like the show) and the shots aren't that fun--nearly every shot has to have a stoppage for some callout.
Class of 1812 - It's all multiball. Thankfully, a lot of people want this title so it was easy to unload.