What are some alternatives?
When comparing Team Fortress 2 and DotA 2, you can also consider the following products
Overwatch - Stylized team-based FPS
Heroes of Newerth - Heroes of Newerth is a Fantastic, Action, Multiplayer Online Battle Arena, Fantasy, Strategy, and Multiplayer video game created and published by Frostburn Studios.
Warframe - Ninjas Play Free.
League of Legends - League of Legends is an Entertaining, Action-Adventure, MOBA (Multiplayer Online Battle Arena), Online and Multiplayer video game developed and published by Riot Games.
Doom - Doom is a science fiction horror-themed first-person shooter video game in which players assume the...
Arma - Experience true combat gameplay in a massive military sandbox.