3D Legend of Zelda games for me. I tried Wind Waker and Twilight Princess, and just could not get into them, rarely making past the first dungeon. I loved the 2D games (particularly Four Swords on Gamecube) but could not get into the 3D no matter how many times I tried.
Then, years after trying the last time, I got Ocarina of Time 3D, and absolutely loved it. Its now one of my favorite games and series. Re-tried Wind Waker with the HD version (for the same reason I tried OoT in the first place: lack of game on their respective systems,) and loved it this time, and I eagerly look forward to whatever Nintendo has planned for Legend of Zelda HD.