Yeah, overall I think I'm 2016 > Eternal > Dark Ages.
I loved a lot of what 2016 did, I also loved that it included multiplayer and snap map so it felt like there was a lot of content. I wasn't too keen on the whole locked area gore nest thing, but that was small compared to everything I did enjoy.
I liked the increase on speed with Eternal's gameplay, I also loved all the connections to the original DOOM in regards to demon design, colors, etc. But I felt like as a whole the game had less content than 2016. But it still felt fun and polished.
Dark Ages still has fun on the ground gameplay, but I could've done without the turret, Atlan, and Serrat sequences and just had more on the ground levels. I wasn't too big on the big open areas either, it just felt less like DOOM and more like Serious Sam or something whenever that happened. I mean DOOM 1/2 DID have open areas, but not THAT open. There's also a LOT less content, so once you're done with the campaign, that's it. I did dig the Medieval vibe and the art and design of some weapons, demons, and environments. But the game felt rushed to me in a lot of ways. SO many invisible walls, some pretty eh level design in some cases too. So many issues with the music mix as well, I had stages where there was just no music at all.
I still enjoyed it and had fun. But yeah, I think it was kind of a no brainer decision for me.