In October 2007, Valve
disabled access for the Windows version through the required authentication system Steam when customers imported the from Russian or Thai from outside of those countries, as the price was up to 4 times as low there. Those users are greeted with the message incorrect territory
when starting the game.
The ESRB rating for the game uses the symbol "T-M" (products range from Teen to Mature).
- 2007 – #2 Game of the Year
- 2007 – #4 Console Game of the Year
- 2007 – #2 PC Game of the Year
- 2007 – PC Game of the Year (Readers' Vote)
- 2007 – #3 Xbox 360 Game of the Year
- 2007 – PC Action Game of the Year (Readers' Vote)
- 2007 – PC Multiplayer Game of the Year