Team Fortress 2 is a game that has defined the genre of team-based shooters, if not invented it. You play as nine different classes in several multiplayer modes, and even in a PvE arena. The nine classes you play are Demoman, Engineer, Heavy, Medic, Pyro, Scout, Sniper, Soldier, and Spy. Each character may be a stereotype, but a fleshed-out one at that. Their roles in the team allow for players to stick with their intended playstyle, but also any playstyle the player wishes to utilize. TF2 is also a tragic story of abandonment, as the publisher and developer Valve has been absent on recent updates to the game. The last update was to add statues in the game to commemorate the death of Soldiers' voice actor, Rick May. Scream Fortress is also the other recent update, but its always been annual to mark Halloween.
It is not an easy game to get into, due to the high skill ceiling of each class. But its extremely rewarding to master each class. Playing this game, you will find a new definition of a team-based shooter. The original definition. (can't say much for Overwatch)