ETERNAL was just way too many arenas with doors closing behind the player for me to enjoy. The only level that had SOME semblance of monsters walking at you in normal corridors was ARC COMPLEX. the rest was just too much Unreal Tournament, circly artificial arenas for me. Everything felt like Slayer gates, just easier.
The speed and frency at which new monsters spawn also takes away from any awe or fear you can feel. In older DOOM games, when a Baron of Hell came out of a "monster closet" it was a big deal, in ETERNAL he hardly registers while you juggle all those plates trying to get the right combination of
jump, double jump, dash, catapult platforms, chainsaw, blood punch, glory kills, shoulder flamethrower, shoulder grenade or ice thrower and the different weapons and their mods.
It felt stressful in a bad way to me as there is almost no player choice how to engage with the next arena. You are thrown into it, the door closes behind you and you better press the right combination of all those tools and weapons or you are fucked.
And yes, the art style totally leaned into the gamey side of things, which is a preference thing, but for me 2016 was moodier.