If you're talking about the Core Module Scenarios, I've played 47of them with most being done prior to being updated. Several of the scenarios I've played several times with various opponents, but have only played a few of the updated releases (especially true of Paratrooper & Yanks scenarios, of which all but a couple have been updated-some substantially). The only ones I am quite interested in playing that I have not played before are from Partisan (if re-released & updated) & Last-Hurrah/Armies-of-Oblivion. The scenarios I had played from Last Hurrah were such stinkers and eventually had such a poor reputation, that I had never pursued playing more than a few of them and have only played one since being updated and re-released (sorely disappointed as well).
However, having said as much, if I find an opponent that wants to play any of these scenarios, I certainly wouldn't shy away from it as I'm just an ASL slut and will play most anything if either of us has an interest [EXC: Subterranean Quarry]. I doubt if I would go out of my way to play any of the core module scenarios simply for the sake of playing them all if neither of us had an interest in the situation/scenario in question.