In order of rankings:

1) God of War 3 (9.5)

2) Splinter Cell: Conviction (9.5)

3) Mass Effect 2 (9.0)

4) Bioshock 2 (8.5)

5) Metro 2033 (8.0)

Note that there tons of other good games I've played, but these top the list as they are all rated 8.0/10 and up in myrating-system. Let's hope that we hit a10 this year with some heavily anticipated Fall/Winter Releases!