Currently Online 
Wii era is overrated. Only really Mario Galaxy 1/2, Skyward Sword/Twilight Princess, Xenoblade, Metroid Prime 3, DKC Returns, Mario Kart Wii, and Smash Brawl are "must plays" and a lot of mediocre to "OK at best" third party stuff.
N64 alone had more must plays IMO. Mario 64, Zelda: OoT, Zelda: MM, GoldenEye, Perfect Dark, Banjo-Kazooie, Banjo-Tooie, Star Fox 64, Paper Mario, Star Wars: Rogue Squadron, Conker's Bad Fur Day, Super Smash Bros., Mario Kart 64 despite having a year less on market.
I understand Wii was successful with casuals, but they abandoned Nintendo anyway and a lot of the software aimed at this audience was frankly shit, so not sure what the net end benefit of all that was. In terms of actual high quality games, the Wii is not much better if at all than the N64 or GameCube. It's claim to fame is a gimmick.
Even GameCube ... Resident Evil 4, Smash Melee, Pikmin 2, Luigi's Mansion, Super Mario Sunshine, Zelda: Wind Waker, Zelda: Twilight Princess, Eternal Darkness, Metroid Prime, Metroid Prime 2, F-Zero GX, Wave Race: Blue Storm, Star Wars: Rogue Squadron II, Mario Kart Double Dash, Animal Crossing, DK: Jungle Beat, Metal Gear Solid: Twin Snakes, more than holds it own with the Wii.
The Wii had a gimmick, the actual software the GameCube had was not that much below the Wii, it may even be a superior lineup if you compared the best 10-15 games against each other.
