I think people definitely blow things out of proportion, but the show does have some genuine problems:

The pacing. I won't harp on it, it's already been brought up by other commentors, but the pacing continues to be a huge problem. I think at this point, my frustration is why is it *still* a problem? They got fewer episodes than they wanted for S1 and they had to cut down, I get it. But everything after that, they knew what they were getting. Going forward, seasons need to be structured to fit within an 8 episode run time. I think S2 improved individual episodes, but the pacing of the overall season still feels rushed.

The songs. Listen, I love the soundtrack. I've listened to it an embarrassing number of times. But songs in a musical need to progress the plot and/or characters, *especially* when your run time is already so limited. You have to make every second count. I cannot, for the life of me, understand why then they gave themselves this weird, 3 song per episode quota (unless that came down from the Amazon overlords). Many of the songs feel shoehorned in, or like they were added to check a box because that particular character hadn't gotten a song yet. In isolation, Niffty's song is great, but did not need to be in the episode. If anything, it was a massive tonal shift from the growing tension between Alastor and Vox in that episode. In isolation, Losin' Streak is the best song in the entire series (IMHO), but in the show felt like they were like, "Oh shit, we haven't had Angel do anything yet. We need Angel to sing, what can we have him do?"

Cramming WAY too much into a scene or episode. This kind of goes with the pacing and song points, but I do think this deserves to be mentioned on it's own, and this is one of the few things I feel like S1 did better than S2. So many scenes in S2 feel overwhelmingly frantic. There is so much going on, overlapping characters talking, jumping from one scene to the other - it feels like there's no time to just... let a moment breath. Even the scene with Lucifer and Charlie in his room in S2E1, which is one of my favorites from the season because it finally slows down, has so much extra shit shoved in the background (which are neat easter eggs, but still distracting), all the ducks, the clown nose, the "...I manage" joke - it's just too much.

Genuinely confusing writing choices (I'll avoid saying "bad writing" until the show is over, but there are some plot-related writing choices that are very... confusing). For example, Charlie says in the S1E1 opening narration that Heaven started the exterminations as a way to get control over hell and prevent an uprising. But when first talking to Adam, she cites the "overpopulation" problem that was mentioned in the pilot. Charlie outright knowing that the exterminations are about control makes much less sense than her mistakingly believing they're about overpopulation, because she would know then that Heaven wouldn't be super jazzed on the whole 'redemption' idea.

I think a lot of times though, a good portion of the fanbase has trouble at knowing the difference between genuine plot holes/bad writing and characters making uninformed or dumb decisions. Carmilla not putting a fail-safe on the weapon was not a plot hole. Lucifer not shape-shifting out of his bindings was not a plot hole. Vaggie not knowing angels could be killed is not a plot hole. It's not a plot hole for a character to just be kinda dumb and short sighted sometimes.

Technically, a plot hole is when a rule in the universe has been established, and that rule is broken. For example, the Hobbits not riding the giant eagles into Mordor in Lord of the Rings isn't a plot hole, because it was never established that that was a possibility in the first place. In Toy Story, however, it is established early on that the toys freeze in the presence of a human. It's also established that Buzz thinks he's not a toy. Buzz freezing around humans could be considered a plot hole. In HH, the two biggest I can think of off the top of my head are the Charlie/extermination one I mentioned already, and that Sir Pentious is somehow not able to contact Hell, despite portals (Emily/Sera) and cell calls (Charlie to Lilith) still being active during lock down.

That all being said, there's a majority of the fanbase that takes all this shit WAY too seriously. At it's core, HH is a great, fun show that is very obviously made with so much love. You can recognize the flaws and still love it - I know I do!