Finished it.
It's.. not strictly a bad game. But it's not the sequel I expected and hoped for, and personally I did not enjoy or have as much fun with this as I did with 2k16.
The combat feels like they tried to put too much into it with all the weapon mods, the flame belcher, the grenades, chainsaw, glory kills, weak points etc., ultimately ending up with something that feels unnecessarily complex, especially when playing with a controller. Not bad, but 2k16 managed to perfectly balance the elegant simplicity of OG Doom's combat with modern combat. The combat in Doom Eternal felt overdesigned.
The story is a goddamn mess. I have no idea what the Hell that was all about. I have no idea who the Sentinels were, why their city/land fell, how they met the Maykrs, how the Maykrs set up their deal with Hell etc. The game suffers from the same problem Final Fantasy XIII did, where the game tries to push so much backstory and lore it ends up having a massive datalog it expects you to read.
The platforming is generally terrible too, and just mucks up the pacing of the game, just like the one enemy people love to hate, the Marauder. I would've been fine with the platforming if it wasn't so damn cumbersome. Like, the platforming sections in Exultia and Urdak? Straight up shit. It feels like the level design is very uneven in quality and design, like there were two different teams designing the levels, and both wanted to do different things with the level design. The levels also felt too long, and by the end of chapter 9 the game was just dragging on, and it had overstayed its welcome with me.
The Marauder is boring as fuck to fight too. He was fine as a one off boss fight, but using him as a regular enemy was just annoying.
The Khan Maykr fight was also straight up bad, with the limited ammo, flying boss, getting knocked off platforms, the floor is lava, her self-healing ability and having six lifebars you need to knock off. I had more trouble fighting her than the final boss.
Overall, it feels like id believed that 'bigger and more is better', but ultimately ended up with a game that I personally found to be a worse and lesser experience than its predecessor.