Got bored over the holidays so I reinstalled Doom (2016) and finished the campaign. I'm still pissed at losing progress on the 6th level during my last attempt, but I powered through that map and beat it again. This time, I didn't care about finding every single secret, but I did get most of the rune trials. That goes for the remaining levels too.
Gotta say, with some of these runes and the weapon upgrades, you can become pretty much unstoppable. For example, pair the fully upgraded and mastered super shotgun with the maxed "Rich Get Richer" and "Armored Offensive" runes, and you have infinite ammo for a weapon which erases most demons from existence with a double click. Similar results can be achieved with the mastered siege mode for the chaingun and the mastered micro missiles for the heavy rifle. Farming those masteries took a while, but fortunately, you can revisit any of the previously completed levels for that. This is nice as some of the early maps contain hordes of weak opponents (like zombies) which are perfect fodder for this.
All those upgrades, masteries and runes definitively helped during the big arena fights in the last two levels. These might drag on a bit too long, depending on one's tastes, but the atmosphere is great. Mick Gordon's awesome soundtrack (especially BFG Division) pumps you up while you're annihilating literal swarms of demons which keep spawning all around you.
On that note, my only (minor) gripe with the enemy behavior was regarding their spawn mechanics. Sometimes, while you're circling around the arena and avoiding enemy fire, a powerful demon would spawn right next to you, and could take a big chunk of your health before you even realize what's happening. Probably the worst case scenario here is when two pinkies (or specters) suddenly appear behind you and perform a bull rush before you have a chance to react. This is somewhat random and not very common, but it can put a blemish on an otherwise perfect arena run. The final boss was kinda meh, and I enjoyed the Cyberdemon and the Hell Guard fights a lot more. To be fair, the Spider Mastermind wasn't all that great in the classic Doom games either. I did like the "fatality" that Doomguy performs on that thing in the end though.
All in all, I'd say that Doom (2016) is a very good game. It was definitively much more satisfying to replay this on my PC using keyboard and mouse instead of the controller, which I of course had to use on my PlayStation 4. Beware of that bug in the 6th level though. The best way to avoid it is to do both rune trials as early as possible, and to never backtrack after encountering the Barons of Hell for the first time. Aside from that single game breaking bug, and one or two random crashes during my 20 hours of playtime, I didn't encounter any other major issues.
P.S.
On my 5.1 speakers, positional audio in Doom (2016) was subpar compared to Doom 3 + EAX 4.0. I could barely tell from which direction a sound was coming from, as everything was sort of jumbled together. Don't get me wrong, the actual sound effects were awesome, just their positioning in 3D space sucked.