Team Fortress 2 is the sequel to the game that put class-based, multiplayer team warfare on the map. It delivers new gametypes, a signature art style powered by Valve's next generation animation technology, persistent player statistics, and more.
In 2007, TF2 was released to much critical acclaim. I thought it was a great game, but today it is just a shell of what it used to be. A once fun game that was all about the action turned into a free-to-play game that nearly matches WoW with the amount of time people wasting time getting useless things like hats on it. The "balancing" of the classes ruined the actual gaming aspect of it for me, and once it became Free to Play, I decided the game was no longer fun and stopped playing it.