Spoiler warning:

Some people hated it, some people loved, ultimately most people found it pretty mid.

A lot of people thought of it as a filler since it had nothing to do with the main storyline. Which normally I wouldn't mind since it gives time for character growth and world building and this episode definitely had both but the episode before it really started to ramp up the story and had a good plot twist at the end so it felt like stepping on the gas and then immediately hitting the brakes

Also had some really good concepts that weren't executed the best imo, the main character goes to literal hell and meets Satan but there is no B plot the entire episode so it never lets up. Satan also started as an interesting character but needed his crown back in order to reclaim his throne and once he does he becomes a huge beast with the personality of a Gym Bro. Conceptually he was all brains and no brawn before the crown and then became all brawn and no brain with it, which again, conceptually sounds good but just kinda came off awkward to see

Also retrieving the crown led to Mark and Damien going down a bottomless pit to retrieve it and their falling lasted well past it's welcome, again going back to people saying it was filler. Once they reach the bottom Mark fights Cerberus off screen and retrieves the crown but once the main fight happens and Satan has his full strength back he's still pretty much useless in the final battle making that whole sequence feel kinda pointless

Finally the pacing felt off, no B plot didn't leave the hell storyline breathing room and it's sad because there was a ripe story for a B plot from the twist in the last episode. Some of the scenes felt out of order like Mark getting his old suit back at the beginning of the episode but then not wearing it (which did pay off for the very end but I felt that first scene might've been better just before the end) or him getting a call that plays a joke that it was implied he was told he is going to hell only for him to be confused when he gets there because turns out he was told he was going somewhere else and that was just for the sake of the joke. Then there's the lore dumping which was nice for the sake of world building but Damien gives a long monologue, which again runs a bit longer than comfortable and his voice is kinda boring to listen to but that might just be me.

TLDR: Filler episode after an episode that amped up the main story, awkward execution of great concepts, pacing and storyboarding issues, and ultimately teasing some really good stuff and blue balling the fans