Unity doesn't have the marketing budget that Epic Games has.
Also for years the free version of Unity hasn't let developers remove the default Unity logo from their start screen so it gained a reputation as an indie engine.
These days it's used for far more than just gaming, it's become a powerhouse for CGI animation in Hollywood and it's the king of AR & VR.
Anyway here's some Unity games that push graphics and shit:
Iron Man VR
Nascar Heat 5
COD Mobile (never played it so just guessing here)
Endless Space 2
Ori 1 and 2
League of Legends Wild Rift