I have to say, the closer we get to 2010, the more and more I'm of the opinion that 2009 has been one of the biggest gaming letdown years in a while. We're running out of time and I have yet to see a whole lot of anything good coming from this year.
Now this is just my opinion on the games I was waiting for, but I'll share what I think was a huge let down to me in general...
StarCraft 2 - pushed back some more
Dawn of War 2 - turned out to be a giant pile of junk (Not that its a terrible game, but after you play it, you'd rather be playing Company of Heroes instead)
Left 4 Dead2 - Got announced while L4D1 is still a broken\buggy mess (They're working on it, I know but I don't have a lot of faith. Maybe November will take me by surprise here.)
Aion - Played the beta and wasn't impressed one bit.
Halo 3: ODST - I dont' really need to go into detail here, but bottom line is... 6 hour, terrible storyline on Legendary? One of the achievements is to go through a level without firing a single shot on Legendary. I'm sorry but that should be impossible in a halo game.
Operation Flashpoint 2 - I Don't have personal experience here, but from what I can tell it plays like a giant piece of junk on the PC, a clearly marketed Console game from a company that used to be a shining light in realistic shooters for the PC.
There's still hope yet, I'm anxiously awaiting Borderlands, Super Mario Bros Wii, and CoD Modern Warfare 2. But if these flop, I think 2009 is a bust gaming year.
In the opposite corner though...
Batman - Arkham Asylum and Red Faction: Guerrilla were both insanely amazing games for the console. I guess console has it going on this year at least, poor PC.