I hate the machines you thought were the best ever, maybe 10 or 20 years ago, now make you ask yourself "what did I like about this?"
I recently had that revelation with what I thought was the dream machine lineup - Medieval Madness, Black Knight 2000, and Creature from the Black Lagoon. I've played all of them over the past few years and thought "eh, yeah, next...." Not that they're bad, because they're not, but wow - I guess the memories of "what was" really wasn't "what is" at least today. They just don't hold the same fascination anymore. It's a bit depressing.