My issue was the constant running out of ammo, and the controls got to be a bit much. I liked 2016's simplicity. Maybe one day I can learn to appreciate it. I know iD went to great lengths to get this game looking and running its best.

id*

The chainsaw auto-refills, that's all you need to know. The constant running out of ammo pissed me off too until I discovered that little nugget of info.

I do, however, preferred the simplicity of 2016 too! Super Shotgun + gauss = fun :)

I heard plenty of complaints about running out of ammo but never had those issues myself. Chainsaw auto refills and there always are low level demons to hack through for ammo. Dash also is fantastic. Playing back through 2016 feels so sluggish and slow in comparison without it, and that game is anything but that. And all gadgets and additions quickly became second nature to me. I didn't struggle much with more controls.

I also really appreciate the fact that different weapons are more useful in different situations, makes all the engagements a bit more strategic but not enough to take away the fun of it. My primary nitpick with Doom 2016 was that I just defaulted to 2 weapons for basically the whole game, which is a shame considering I find every weapon in both games to be a blast to use so being in low key way forced to switch is a positive in my opinion.

What I did not like with Doom Eternal is third person cutscenes. It kinda takes away from you being the Doom Slayer to you just being around him. I think they could've done it without it and I believe the story would also flow a bit better too. And the Marauder. I really don't like the "one way to defeat an enemy" kind of enemy. Fighting him is just a pain. It isn't hard but it gets boring as there's only one strategy involved in defeating him and you can't deviate.

The marauder becomes a joke when you figure out you can ballista>rocket>SSG/BloodPunch him in about 2 turns.
Lore-wise I understand why he's like that, because he's essentially a fallen slayer, so they are MEANT to be tough. But that toughness comes in a different form than I'd prefer. I'd rather him be fast and aggressive, but not artificially resistant to even the BFG or the Unmaykr until his eyes glow green, which is really just ridiculous.

As for the changes since 2016 - mixed bag for me. I did actually like defaulting to my SSG+Gauss in 2016 and becoming good at it. It took away the "thinking" aspect and made the game just pure "mindless fun" as I call it. Nothing wrong with that. Eternal really felt forced in that regard - you end up playing more or less how the devs intended, not how YOU want to, which isn't always a good thing - it would work for a narrative-driven game, not so much an action game like DOOM.

While the 3rd person cutscenes did feature in DOOM3 - DOOM 2016 really worked well. You felt like the Slayer didn't give a crap about instructions and did things his way - no face or words needed, the fists, guns and boots did the talking well in 1st person.
It was weird hearing the Slayer talk. The voice didn't really make sense to me (not deep enough to capture my imagination of the masculine force of destruction), kinda ruined the magic. DOOM Guy is "the silent protagonist", as he was described in the Quake Champions lore - I prefer it that way.

I agree completely about the Marauder. Make him be challenging but not invulnerable. It misses the mark and really slows down the game. I'll try to remember that combination next time I'm playing Eternal though.
I also have nothing against maining a weapon or two for example. I'm fairly certain my opinion on this topic is probably in the minority. Whenever I play any game, I tend to default towards efficiency, and occasionally I drift so far away that it ruins the fun.

That's the issue that I had with Doom 2016, weirdly enough. It was still my game of the year next to Xcom 2 and Hitman though.
So basically, for apparently entirely selfish reasons, I do like the fact that I am somewhat forced into switching weapons. I'm well aware it's more limiting that way than 2016 was, but I had so much more fun playing this game that it didn't really matter to me. It got rid of that efficiency and made me kinda relax and just have fun.

Ironically it’s been mostly console games that hit the mark for me like god of war. Recently ff7r, looking forward to ghost of Tsushima. Persona 5 was also one my fav this gen. Unfortunately these games are too few and far in between. Wish there were more on the pc side that catered to great narrative direction

What about Horizon Zero Dawn have you played it? It's coming out on PC soon, wondering if it's worth getting?

Yes thats worth playinh especially since part 2 will be out for next gen.