This happened pretty quickly with Doki Doki Literature Club!.

After more than 2 years of hiatus on the game, they continued where they left off, and Arin apologized for doing a disservice to the game.

The same criticism can be leveled at their playthrough of Majora's Mask, as we see Arin completely forgets about the Song of Soaring until almost reaching the second dungeon, and otherwise treats the game with overt scorn while dissuading Danny from getting invested in the story or characters, which are the primary reason it is held in such high regard.

This wouldn't be so bad if he hadn't made a 30-minute video on why the game is bad, but the series, in addition to its longevity, is also serving to punch more holes in his argument as opposed to grounding it. The series is 84 episodes long, with many of the episodes consisting of Arin getting stuck somewhere, complaining the game isn't being clear on what to do/where to go, constant deaths which result in backtracking (and then more deaths because Arin refuses to stock up on supplies), Arin's baffling insistence on keeping the Hover Boots (a situationally useful item that otherwise impairs you by making you slip like you're on ice) equipped, and in general failing to grasp the mechanics of the game. It's now the longest-running series in the show's history, though they do at least break it up with other games. Adding to this is that it actually could theoretically go on forever with new levels being created every day (which Dan realizes with some awe in Part 95), plus it still gets by far the highest viewing numbers in the show's history, giving the guys very little incentive to stop.

Many fans got tired of Super Mario Maker by the time the video count reached the 70s.

Word of God is that they're sticking to the same games because they're too lazy to change and reset the equipment. Coupled with the fact that episodes are only 10 minutes long and they don't cut out padding, you'll have long stretches where nothing is accomplished in episodes.

In general, many series from 2015 lasted for weeks with little to no breaks.

Enough time for people to get sick of it. Originally well-received, its second session lasted for 26 uninterrupted episodes as opposed to the usual 6-10.

Game grumps whos your daddy