I played Doom Eternal back when it first released; and while I never completed it I remember it being a lot of fun. So I decided to not only give it another go but also grab Doom '16 since it's been at least six years since I last played that. Sweet Jesus is that a study in compare and contrast! One of the other reviews here said DE is D'16 but more; and while an accurate assessment, it's more in all the wrong ways.
D'16 is fast paced, yet the movement feels solid and weighty, yet responsive. The arenas are varied and sometimes claustrophobic, and yet I never felt constricted or constrained. DE on the other hand is fast, but its movement airy, flighty, and over responsive; and no amount of adjustment to the sensitivity makes it feel "right". The arenas in DE feel like an act of containment. Where as inn '16 I only got stuck when I messed up and got backed into a corner. Now it feels like every little thing is conspiring to constrain you and trip you up, to the point where I felt less agile despite now having a dodge ability.
Then there is ammunition. In '16 your shotgun starts with just thirty shells, a harsh limit and one which pressures you to not be wasteful. However in DE you start with a mere 16 with a staggering three extra shells per ammo upgrade; being awash in such generosity is truly astounding. Being almost out of ammo in '16 and chainsawing an imp rewards you with an oasis of ordnance, a second wind to finish the engagement. In Eternal I get a mere ten seconds of additional gun play if I'm lucky.
Next are the secret encounters and slayer keys both of which actively punish you for partaking in them. They're both more of every issue I've already stated on top of being bad resource management. Victory means potentially getting a weapon point that you're already awash in. Failure means loosing everything you used and trying again means throwing good money after bad. That's the most infuriating part, your reward for dusting yourself off and trying again is a punch in the ♥♥♥♥. Compare to the Rune challenges in '16. While there where badly designed and infuriating challenges. Beating them rewarded you with abilities to fine tune your play style and repeated attempts only cost you time and energy.
I've used the word feel a lot in this review; because that's this games biggest problem, it feels off and wrong. Perhaps I didn't notice the first time I played since there was a years long gap between playin '16 and Eternal. But playing them back to back and it all feels like an exercise in rucking through The Uncanny Valley.

after 5 seconds of playing this again it feels and looks so much better than the dark ages man

Mick Gordon was repeatedly abused during and after production.