Bloodlines is the best so far this year. I'm surprised, I didn't expect Bloodlines to do well at all in terms of sales. Has some tech issues though.
As to GOTY, sadly it will be GTA San Andreas, imo. Halo 2 was too disappointing in terms of length, level design, and ending. Half Life downfall, one word: Steam, not to mention boring plot and uninspired bad guys (or so I've been told). San Andreas was the only one to deliver on expectations, it seems.