What are some alternatives?
When comparing GameRankings and DotA 2, you can also consider the following products
IGDB - An open video game database
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.
Metacritic - Metacritic aggregates music, game, tv, and movie reviews from the leading critics. Only Metacritic.com uses METASCORES, which let you know at a glance how each item was reviewed.
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.
MobyGames - MobyGames is the oldest, largest and most accurate video game database for games of every platform spanning 1979-2018.
Quake - Quake is a series of first-person shooter video games released by id Software.