https://www.polygon.com/2017/8/28/16215092/dota-2-steam-user-reviews-half-life-3-artifact

As Half-Life 2: Episode Two approaches its 10-year anniversary, fed up Half-Life fans are taking their long-simmering aggression out on one of Valve’s other games, Dota 2. As spotted by PCGamesN, Steam users are bombing the game with negative reviews, many of them laying blame on Valve’s popular MOBA for the lack of a new Half-Life game.

The rush to trash Dota 2 in Steam user reviews appears to be related to two recent developments: Valve’s announcement of Artifact, the Dota card game, at this year’s International tournament, and Half-Life writer Marc Laidlaw publishing what is widely interpreted to be the proposed plot to Half-Life 2: Episode Three.