A couple come to mind for me, Twilight Zone is one i did a shop out job on a few years ago, had it at my home for a month so i had plenty of time to play test it, couldn't get into it much at all. I played VERY SAME TZ on site several years before hand, same deal.
Terminator 3 which i played at Newcastle pinfest, i couldnt get into either, though i didnt really put a lot of time into getting to know it while there, so maybe if i'd been able to spend more time on it things might've been different.
From the point of view of games i own (or have owned) Klondike probably got played the least, sold it a few months ago to Andy (AP member greenechidna). though i must admit i do miss it a bit since its been gone.. at least i can still see it and play it when i visit him
