I can't really put up a high quality top 5 so far this year. Temporary lay-offs, and finally, a permanent lay-off at my job has caused me to hardly have any free cash to spend on games. Also, the only two systems I own from this gen are Wii and DS. But here is the list I can cobble together from my meager recent additions to my collection...
Metroid Prime 3
RE4 Wii edition(though it shouldn't be considered for GotY since it's a re-release)
Super Paper Mario
The Godfather
SimCity DS
I imagine by the end of the year only Metroid Prime 3 will still be on my list, with games like Galaxy, Zelda PH, and Z&W taking their places.
"I feel like I could take on the whole Empire myself."