I've learned to trust my wife's opinion of a pinball machine. She sees it as a novice would and soberly reports it strengths and shortcomings. Unlike me she doesn't think about what was paid for the game, it's history, it's future potential with mods/LEDs (or any of that nonsense) and whether or not it was popular back in the day. She's never been wrong. Never... The games she said don't sell ~ I shouldn't have (ugh) and want them back. The titles I bored with quickly ~ she didn't even finish playing the 1st game. We'll go somewhere and she'll naturally gravitate to the best playing machine in the arcade.
All this and she's not even into pinball. Who heads up your pinball testing department?