No, the harder the more longevity. My Flash Gordon with a cpr playfield is just brutal. It is the pinball equivalent of a kick in the nuts. Somehow when the stars align and I put a good game together, it makes that much more fun.
The guy above made a good analogy to women. You never marry the easy ones.
I played my buddy's TWD and really enjoyed it. I like what Stern has been doing in recent times.
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