The greatest level in the entire Doom series is still Phobos Lab. It doesn't have the gimmicks of a Doom 2 stage, the dark claustrophobia of Doom 3 and 64, or the speed and scale of Eternal and 2016's ...
I missed the 2016 DOOM installment and, while DOOM: The Dark Ages is a prequel, it heavily relies upon knowledge of DOOM and DOOM Eternal. After all, it begins on Argent D’Nur with the Night Sentinels ...