If I had to throw my hat on one slot that causes the most consternation across the gambling sphere, it'd have to be Bonanza. It's responsible for the most problematic gambling travails in recent memory, I don't think even DOA at its peak came anywhere close.
What most will find is that it becomes a love/hate slot over time. Everyone will have their time in the sun, believing to be the 'one that has been chosen over others' when it plays well, and it can do. But more often than not it's fleeting, and will result in cursing aplenty if played long enough.
Let's face it, ain't no one here gonna get the 15,000x, so let's put that one to bed right now....
So all in all, Bonanza will cause highs and lows, feelings of euphoria followed by long periods of frustration and regret. Basically like being married