...Why am I posting this list?
001. [NDS] Pokemon Black / White (Pokemon Co.) {2010.09.18} - 4.966.738
002. [NDS] Dragon Quest VI: Realms Of Revelation (Square Enix) {2010.01.28} - 1.343.447
003. [NDS] Dragon Quest Monsters: Joker 2 (Square Enix) {2010.04.28} - 1.230.487
004. [NDS] Inazuma Eleven 3: World Challenge!! Spark / Bomber (Level 5) {2010.07.01} - 889.803
005. [NDS] Pokemon Ranger: Guardian Sign (Pokemon Co.) {2010.03.06} - 490.630
006. [NDS] Ni no Kuni: The Ebony Wizard (Level 5) {2010.12.09} - 382.287
007. [NDS] Inazuma Eleven 3: World Challenge!! The Ogre (Level 5) {2010.12.16} - 338.413
008. [NDS] Taiko Drum Master DS: Dororon! Battle With the Ghouls!! (Bandai Namco) {2010.07.01} - 324.122
009. [NDS] Magician's Quest: The Merchant’s Store of Sorcery (Konami) {2010.11.11} - 277.499
010. [NDS] One Piece: Gigant Battle (Bandai Namco) {2010.09.09} - 275.686
011. [NDS] Art Academy (Nintendo) {2010.06.19} - 270.654
012. [NDS] Fire Emblem: New Mystery of the Emblem - Hero of Light and Shadow (Nintendo) {2010.07.15} - 263.760
013. [NDS] Mario Vs. Donkey Kong: Miniland Mayhem (Nintendo) {2010.12.02} - 261.600
014. [NDS] Super Fossil Fighters (Nintendo) {2010.11.18} - 238.726
015. [NDS] Kingdom Hearts Re:coded (Square Enix) {2010.10.07} - 199.505
016. [NDS] Harvest Moon: Twin Villages (Marvelous Entertainment) {2010.07.08} - 189.584
017. [NDS] Super Robot Wars L (Bandai Namco) {2010.11.25} - 169.790
018. [NDS] Love Plus + (Konami) {2010.06.24} - 165.964
019. [NDS] Tokimeki Memorial: Girl's Side 3rd Story (Konami) {2010.06.24} - 146.278
020. [NDS] Etrian Odyssey III: The Downed City (Atlus Co.) {2010.04.01} - 141.899
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001. [WII] Wii Party (Nintendo) {2010.07.08} - 1.676.891
002. [WII] Super Mario Galaxy 2 (Nintendo) {2010.05.27} - 947.540
003. [WII] Super Mario All-Stars (Nintendo) {2010.10.21} - 803.453
004. [WII] Donkey Kong Country Returns (Nintendo) {2010.12.09} - 638.305
005. [WII] Mario Sports Mix (Nintendo) {2010.11.25} - 493.938
006. [WII] Kirby's Epic Yarn (Nintendo) {2010.10.14} - 386.780
007. [WII] Dragon Quest: Monster Battle Road Victory (Square Enix) {2010.07.15} - 275.273
008. [WII] Xenoblade (Nintendo) {2010.06.10} - 161.161
009. [WII] Resident Evil: The Darkside Chronicles (Capcom) {2010.01.14} - 156.176
010. [WII] Taiko Drum Master Wii 3 (Bandai Namco) {2010.12.02} - 140.288
011. [WII] Sengoku Basara 3 (Capcom) {2010.07.29} - 120.797
012. [WII] Kamen Rider: Climax Heroes Os (Bandai Namco) {2010.12.02} - 82.693
013. [WII] Metroid: Other M (Nintendo) {2010.09.02} - 71.410
014. [WII] Zangeki no Reginkleiv (Nintendo) {2010.02.11} - 53.317
015. [WII] World Soccer Winning Eleven 2010: Blue Samurai Challenge (Konami) {2010.05.20} - 49.974
016. [WII] Karaoke Joysound Wii Super DX: Hitori de Minna de Utai Houdai! (Hudson) {2010.12.09} - 38.090
017. [WII] World Soccer Winning Eleven 2011 (Konami) {2010.11.18} - 36.295
018. [WII] FlingSmash (Nintendo) {2010.11.18} - 35.913
019. [WII] Naruto Shippuden: Gekitou Ninja Taisen! Special (Takara Tomy) {2010.12.02} - 35.100
020. [WII] Daikaijuu Battle: Ultra Coliseum DX - Ultra Senshi Daishuuketsu (Bandai Namco) {2010.02.25} - 28.788
See that? That's why. BOTH console Taiko made top 10 of 2010 on their respective console sales. The numbers are units shifted from the time it was released to the end of 2010. Nothing beat Pokemon B/W, of course, except maybe Monster Hunter Portable 3, but that's not on this list. Wii Party was top of the Wii sales, indicating casual power hasn't waned completely yet.
Source: GoNintendo
