StarCraft is too hard for casual players: StarCraft's high APM (actions per minute) requirement and complex mechanics can be intimidating for newcomers. This can lead to frustration and feeling overwhelmed, which some gamers argue limits the game's appeal.
The three races are unbalanced: Balancing three distinct races with unique units and abilities is a constant challenge. Some players feel a particular race, like Zerg, is inherently stronger and easier to win with in competitive play.
StarCraft is a dying game: With the rise of MOBAs (multiplayer online battle arenas) and other genres, StarCraft's player base has shrunk. Some gamers believe the game is past its prime and no longer relevant in the esports scene.