I played the very first Mario Kart on SNES, so that would be when I first liked the Mario Kart series, I suppose. The ones I may have played the most would be the ones on the DS and Wii, since those were my most played Nintendo systems at the time.
While I wasn’t particularly great at it (was only okay), Mario Kart 64 is when I started really enjoying the franchise. Double Dash is when I fell in love though.
I started with the SNES game, but I honestly didn’t like it very much. I wasn’t very good at games at the time, and I kept losing even on the easier difficulties. It was N64 that sparked my love for Mario Kart.