What are some alternatives?
When comparing GameRankings and Doom, you can also consider the following products
IGDB - An open video game database
Quake - Quake is a series of first-person shooter video games released by id Software.
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.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
MobyGames - MobyGames is the oldest, largest and most accurate video game database for games of every platform spanning 1979-2018.
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.