I've thought Doom 2016 was better as well. But I have to say it isn't.
Doom 2016, when I replay it, is pretty much only arena battles, and I feel some go on for a bit too long. By 75% into the campaign I kinda wanted it to end. Doom 2016 starts with imps, then pinky, and every time the tier gets higher. The game pretty much does this from beginning to end.
Doom Eternal has MUCH better pacing. Yes I do dislike its ammo system still, but the battles themselves are actually far shorter and more variation is thrown in. What makes it look like more are the ammo fodder goons, but they're harmless. Once Doom Eternal clicked, It was absolutely insane, it was like playing DMC. You'd be air dashing, grappling, switching weapons, using secondaries etc on the fly. I can see why the ammo management is there, since 2016 would be super shotgun all day, but I still could do with a little higher ammo cap.
Play Eternal on Normal if needed, as Hard is far more brutal than it was on 2016. At least until you mastered its mechanics and know your enemies. I could see people changing their opinion on it. And 120hz is godlike.