Funnily enough one of the worst years for me. Not because I didn't play many, but because half of the games in the poll and 'other' list I played based on how acclaimed they were and just did not enjoy them in the slightest: Oblivion, Gears of War, Twilight Princess, Dead Rising, Wii Play, WarioWare: Smooth Moves, and Saints Row. And some were only decent, like Wii Sports, Call of Duty 3, Elite Beat Agents, Virtua Fighter 5, and LocoRoco.
I had the most fun with MotorStorm, assuming the Japanese release date of 2006 counts. Followed very closely by NSMB, and then Daxter.