My favourite nintendo games of all time are mario kart, super mario and mortal kombat trilogy. There are many other good games but these are the best, among the games which i have played.
NES:
Super Mario Bros. (All of em)
Megaman (again, all of them)
Double Dragon
SNES:
See NES minus Double Dragon
N64:
Goldeneye
Super Smash Bros.
Legend Of Zelda: Ocarina Of Time
Perfect Dark
Super Mario 64
Conkers Bad Fur Day
Handheld:
Pokemon (Had em all except for the newer ones like Ranger and Mystery Dungeon)
Digimon World DS and Dusk (Both for DS.)
Legend of Zelda (take your pick again.)
Dragon Warrior Monsters (Gameboy Colour)
Dragon Quest Monsters: Joker (DS)
Final Fantasy VI (GBA)
Pretty much all I can name off the top of my head. Not sure what it is with Nintendo and releasing damn good RPGs.
World of Warcraft has got to be the best game ever made in my opinion. Ten million people agree with me too because that's how many people around the world playing it.
I really like of all of the Mario games, but really, how can you go wrong with a classic? The other games I really like are on the Wii: bowling, tennis and golf.
Final Fantasy X was a great game. I really enjoyed it; and the music was beautiful. The graphics were great; and the storyline magnificent. I wish they still made games like that; you could really get into the story and sympathize with the characters.