What are some alternatives?
When comparing DotA 2 and League of Legends, you can also consider the following products
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.
Quake - Quake is a series of first-person shooter video games released by id Software.
Heroes of the Storm - Heroes of the Storm is an Engaging, Action, Fantasy, Strategy, Multiplayer Online Battle Arena, Combat and Multiplayer video game created and published by Blizzard Entertainment.
Overwatch - Stylized team-based FPS
Awesomenauts - Awesomenauts is a Gorgeous, Action, MOBA (Multiplayer Online Battle Arena), 2D, Platform, Sci-fi, Co-op, Single and Multiplayer video game developed and published by Ronimo Games.
Battleborn - Battleborn is an Online, Action-Adventure, FPS (First-person Shooter) Single and Multiplayer video game created by Gearbox Software and published by 2K Games.