In kind of like sparf in that I learned to appreciate a whole format, not just individual games (though there have been plenty of those).

Specifically, I used to dislike the neo geo. from what I could see of the system at arcades (which isn't much) the games didn't seem that much better than a snes game, and that what I perceived to be zero depth. Plus that plethora of fighting games that snk spewed out towards the end all seemed identical to my untrained eye. But a few years ago I snagged that snk collection for ps2. I started to really appreciate the subtleties that make the neo stand out from its contemporaries: huge sprites, detailed animations, liberal use of audio samples with minimal compression...plus I saw the grandeur that is neo turf masters. I ended up getting a consolized mvs and I now have a pretty huge neo collection. It's something special and unique, and I really appreciate it now.