I was intrigued by the trailer I saw in the Humble Indie Bundle, and a friend of mine picked this title up for me. I would have gladly paid full price for it if I could have. In short, this is an absolute gem of a game.
The music is absolutely wonderful, and it engages you with the gameplay. The plot (such as it is) and the art style might not be for everyone, but if you enjoy throwback to pixel-era graphcis and vague mystery men pushing you in the right direction to save a world in your own woeful tale (ahem, Half Life 2), I do believe you'll get a kick out of this one.
It's also short (insofar in that it can be beaten in a month - less if you 'cheat'), so it's a nice title to hold you over until the bigger releases arrive.
Really, just pick this up. It's utterly fantastic and absolutely worth your time.
I'm not normally a fan of the Call of Duty franchise, but this game was a complete 180 degree turn around for me. A very competent single player mode with wonderful characters and a riveting story makes this a favourite of mine. And there's a particular part of the story where, once you reach it, it will break your heart a little. The game gives you pause about current issues of warfare, and how we utilize it, and as such, I couldn't put it down. All you tend to hear about is the multiplayer, and while that's great, the single player mode is where the game truly shines. This, along with a few others, are amongst the first FPS that I could honestly say I throughly /enjoyed/. Seriously, pick this up.
For someone who doesn't normally play zombie/survival horror games, this series was a real pleaser. The controls are intuitive, the gameplay is varied and fun, and the characters are absolutely awesome. The humor and hints to pop culture really make the series shine, too. I couldn't recommend this (and L4D2!) enough.