Temporarily at least. Not getting Forza Motorsport 7 because it adds very little of interest over 6, focusing on driver gear that surely no one ever asked for, at the expense of more tracks that people are always clamouring for, even just the return of many from earlier in the series. And they pretended they added far more cars than they actually did. Plus Horizon 3 was such a disappointment compared to 2.
Historically I can't think of other examples of swearing off, but I never got Legacy of the Void; kind of stopped RTS play, and PC play for the most part, and the story was apparently nothing to write home about.
Other series got worse but I stuck with them, and then just went back to the previous ones as that was an option. Escape Velocity - peaked with Override, Nova was more just an interactive novel, and even that is 15 years old now, sad. Warlords - peaked with 2 and 3, 4 was a disappointment, and then the devs switched to making match-3 games, even sadder.
The best example could be WoW, but it's more just managing not to buy the new stuff. Have not done Legion at all, and now the announcement of Classic Servers in the future is more exciting to me than any new content really could be. It is just a shame that the next new zones are the most relevant to the Vanilla world we have had in ages. If only they would start a new trajectory from Vanilla based on the original plans - Dragon Isles, rather different Quel'Thalas, Undermine, Azshara Crater, and so on. Would be very interesting.