Mario, Zelda and Metroid franchise will always remain as the gaming references. I consider Mario Galaxy the best one, better far away from N64 Super Mario, and TP too was a bright game.
New Super Mario Bros Wii is the most addictive one. It's the one you play, you're mind blowed by the multi, then got bored, and you return on it after and play again and again. Although it looks like the DS version, the game is my favorite 2D Mario with Super Mario Bros 2 & 3.