Ghost Recon: Advanced Warfighter
I'll be honest here, I didn't actually plan on ever playing it. The story goes that I was building my new computer, and happened to buy a GeForce 7950GT. I had no idea it came in the box with the card for free. I like free games, so I figured I'd give it a shot.
At first, it takes some getting used to. It's awkward and boring first mission didn't really have me coming back. After I go through it though, it really started to pick up. Urban combat at its finest.
If you like intense urban conflict squad based shooters, I would seriously recommend you pick it up. Haven't touched the multiplayer yet. Not sure if I will.