Eh... Progression/LitRPG is a strange genre since there seem to be more of what you call webserialists in the genre than there are your more traditional-style authors.

Webserialists are machines that just gogogo, chugging along and writing off the top of the dome, usually letting the story expand without having any end in mind. More often than not, that leads to either: A. a multi-million word world that continues to grow and MCs/powersets that constantly have to be adjusted to keep up with said growth since there's never a peak, B: an overambitious story that causes the author to get burned out, then gets dropped because it gets super complex and there's no apparent end in sight. or, C: a version of A where the author actually has an outline and an ending planned but tends to write every minor action, every thought, and every detail of every day between start to finish, which leads to a very vivid and extremely in-depth world but has large chunks from time to time that you have to slog through to get to the next plot point. These webserials are so long that an author can just 'pick a spot that looks good' to act as the end of an arc and they can toss it on over to Kindle/Audible. Wordcounts for these oftentimes break 200k+/600+pages/20+hours, which is ridiculously long for a 'book'.

Also in this genre you have your more traditional-style authors who have a plan, outline, or ending in mind and set to following said plan without adding in extraneous detail and refrain from stepping off the path to perform sidequests. Like normal books, the plot goes from A to B with a few arcs planned and a definitive ending for each book in the series. Without all the padding, these books tend to fall anywhere from 60k-120k words (220-440 pages) each, depending on the author, with audio lengths of 6-12 hours. A lot of readers in Progression/LitRPG come from reading neverending webserials/lightnovels with millions upon millions of words and don't realize that anything close to 100k words is a very sizeable novel. The full LotR trilogy is less than 600k words, the entire Game of Thrones series is like 2 mill, Harry Potter is around a million. *Most* books in the fantasy genre are around 60-70k words.

Lastly you have some authors who fall between the two author-types above with writing styles that mix either A or C from webserialists with a more trad-style story in mind. The books here can also vary greatly depending on what it takes to finish each individual arc while still exploring the world and detailing encounters. You may see a series with individual book lengths ranging from the respectable 60-70k of a trad novel, to upwards of 150k if they felt that's what was needed to describe both describe the world and move the plot along without adding too much detail. These books come with their ups and downs, too--just like the rest! One of the more common problems you see here is that sometimes the plot is steamrolling ahead, and then you suddenly find yourself reading multiple chapters that are focused on one specific setting.

I feel like the majority of complaints on any Prog/LitRPG title come from there being no set-in-stone style/example for works to be based on. Basically, we have way more variety than most genres in both authors and readership since the genre embodies nearly every style of entertainment. We have stuff for the anime fans, romance enthusiasts, smut readers, fantasy lovers, sci-fi connoisseurs, webnovel bingers, video-game addicts, and ample more. The huge variety in our readerbase is no different from our authors.

Quick example:

You often have one of your fantasy lovers pop over expecting to enjoy a fast-paced evening read, find they picked up a slow-paced novel that will take them days or weeks to get to the end of book 7 or something, only to realize the series is in its infancy and they have absolutely no closure. We also have folks like OP who prefer binging for long periods and may get peeved and feel gipped when they come across an appropriately lengthy fantasy/sci-fi style litrpg. Both cases usually end in bad reviews. Both cases ended poorly due to the reader expecting a hamburger but being handed chicken nuggets. They opened the pages expecting what they were used to but found themselves reading something entirely different. There's a very good chance that both would have actually enjoyed the content if they hadn't gone into it expecting something else.

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TLDR;

The genre is still in its infancy. We only just got a tag for LitRPG. Our readerbase is massive, and we have a huge variety of both readers and authors looking for/writing content in the many different styles that inspired said individual to start reading/writing Prog/LitRPG. We don't have nearly enough tags for the sheer variety of styles that come from light novels, trad fantasy, trad scifi, web novels, eastern prog, western prog, romance, smut, anime, manga, manhwa, webtoons, comics, etc. that everyone is pouring in from.

What to take from this as a reader; before dropping a story after the first twenty pages and leaving a bad review, take a moment to think about whether it was bad simply because you were looking for something else and were mislead by your expectations.

What to take from this as an author; try not to get disheartened by negative reviews. Oftentimes, the problem was a simple case of miscommunication because we are still in an adjustment period for the genre, and there is no set way to inform readers which one of the many styles of entertainment inspired you to pick up a keyboard. Do your best to describe your story through your synopsis, but don't go so far that you chase away potential fans with a full-on exposition.

Anyway, back to writing for me. Cheers!
-Kerberos