1°) DS-> Incredible hardware sales and 37 good games this year! Excellent year for DS owners. Am I lying? No..
-Avalon Code
-Big Bang Mini
-Bleach: The 3rd Phantom
-Broken Sword: Shadow of the Templars (The Director's Cut)
-Call of Duty: Modern Warfare: Mobilized (best portable fps, full of action, different campaign from the console versions, online mode)
-Dragon Ball Z: Attack of the Saiyan
-Dragon Quest V: Hand of the Heavenly Bride
-Elebits: The Adventures of Kai & Zero
-Fighting Fantasy: The Warlock of Firetop Mountain
-FIFA Soccer 10 (no, it's not as good as the console versions but it's good for a portable game)
-Final Fantasy Crystal Chronicles: Echoes of Time
-Fossil Fighters
-Grand Theft Auto: Chinatown Wars
-Harvest Moon DS: Sunshine Islands
-Henry Hatsworth in the Puzzling Adventure (pretty hard but it's an incredible 2D platform/puzzle game)
-Knights in the Nightmare
-Kingdom Hearts 358/2 Days
-Mario & Luigi: Bowser's Inside Story
-Mega Man Star Force 3
-Might & Magic: Clash of Heroes
-Nostalgia
-Peggle Dual Shot
-Phantasy Star Zero
-Pokemon Platinum Version
-Professor Layton and the Diabolical Box
-Retro Game Challenge
-Rhythm Heaven
-Scribblenauts
-Shin Megami Tensei: Devil Survivor
-Space Invaders Extreme 2
-Steal Princess
-Suikoden Tierkreis
-The Dark Spire
-The Legendary Starfy
-The Legend of Zelda: Spirit Tracks
-Valkyrie Profile: Covenant of the Plume
-Yu-Gi-Oh! 5D's 2009
(I don't know about all released games, maybe I am missing some games)
2°) PS3-> As much as I don't like Uncharted, I have to agre that it's an indredible game, it's just not for me. PS3 had good games this year and hardware sales are growing.
3°) x360-> Good hardware sales but not enough, it had games like L4D 2, Ballad of Gay Tony and Forza 3 this year, incredible games btw.
4°) Wii-> Incredible hardware sales (I am not surprising that it's doing well) and games like Madworld, Punch-Out!!, Dead Space Extraction, NSMBW etc but I think it needs more action games and unfortunatelly some multiplatform titles like Assassin's Creed 2, Prototype and MW2 aren't coming for the Wii.
5°) PC-> Some excellent exclusives like The Sims 3, Empire:Total War etc but a lot of delays (like Assassin's Creed 2).
6°) PSP-> Compared to the DS, the PSP had weak hardware sales this year and PSPGO was a huge flop in my opinion. This is a great system but it had a low number of good releases this year, some of them are a port/ramake (like SMT, Star Ocean 2, Disgaea 2 etc). Gran Turismo PSP was very disappointing for me because it doesn't have a campaign (which makes Gran Turismo what it is) and Shin Megami Tensei: Persona isn't for everyone, this game can be very frustrating and annoying even for a RPG lover like me. Good hardware sales but not enough, software wasn't weak but it wasn't strong either. I wonder where is a new COD for the psp, DON'T TELL ME fps doesn't works on the PSP because Resistence works pretty well and it's a shooter (well, it was boring for me, but it has good controls and nice visuals!).
Feel free to disagree, this is merely my opinion and yes, I played all the systems above.
Essay Pro