All of those above have very distinct stylisation, lets be honest UT is pretty generic in terms of settingMetro Exodus and Rage are both post apocalyptic which has been done to death in the past decade while both Wolfenstein and Far Cry 5 have you fighting against nazis/cultists.
The first Unreal had an atmosphere that was pretty unique actually: You are a simple worker aboard a transport ship. Your ship is shot down and you land on an alien planet, feeling completely alone and lost while exploring because you have no idea where you are. But step by step, you discover the planets wonders and hazards.
I never played Unreal II but the first Unreal was one of the few fps games that made me feel isolated, alone and scared at times.
Rune was also one of those games that made you feel truly isolated and alone at times, but that is a different game...