This is a personality thing. If I'm playing a game (Or reading a book or watching a movie.) and find I'm no longer enjoying it, i just stop. Somethimes I might come back later, if my mood changes, mostly I don't.

I have no concerns over finishing or not finishing anything I'm only doing for entertainment. It's self-evident to me that if I'm no longer being entertained that's the end of the activity. If it was a chore that needed to be completed or work I was being paid for or a practical project with a meaningful and lasting outcome, then obviously I would carry on until it was done, but the same simply doesn't apply to entertainment and I find it very hard to see why it would. If it's not entertaining, stop. Or, as you describe, do something to make it fun again. Either way, plowing on while not enjoying yourself is not an option that makes sense to me.
 

The majority of folks that buy a game never finish it. Even relatively short games are like this. In Armored Core 6 you can reach an ending in about 10-12 hours and less then 40% of players have made it that far. Less then 30% have done all 3 endings. With longer games it seriously drops off. Baldur's Gate 3 only about 15% of players have stuck with it until the end despite the high praise and millions of copies sold.

If I'm not having fun with a game I drop it these days. I used to compulsively buy games on Steam during sales but I stopped as I realized it was a waste of money to buy a game I wasn't interested playing at the moment.
 

Indeed it is unfortunate when game length is not equivalent to fun time. But with fun time being very subjective, I understand that it can be a difficult target to hit.

For story driven games, I have difficulty dropping it due to diminished fun if I get midway through. I want the closure of getting to the end, so I often then use cheats to plow on through. As much as I understand that for entertainment purposes this makes little sense. An unfinished game or movie often nags at me in my mind while I'm away from it until finished.
 

I note that you still felt a desire to finish the game even though the fun had run out. To me this indicates that there is a third factor at play in addition to game length and fun time. For want of a better phrase I am going to call that third factor the "compelling goal". A simple example is a story based game where the compelling goal is to get to the end of the story. A different example would be a strategy game where the compelling goal is to finish a single campaign before moving on. I think you sum up the concept of the compelling goal very well when you say that "it makes it easier for me to uninstall the game and be done with it".

Unfortunately a lot of modern games turn this compelling goal into a never achievable carrot on a stick. Obviously this is a design feature of cash shop games to keep people playing and paying but it has crept into many modern games even those without heavy monetisation. There is always another mini game just over the next hill or a new game plus mode with added features of some set of extra achievements to collect and there is never a comfortable point where you can feel you have beaten the game and can just move on.
 

Yes, I liked the "compelling goal" of Return to Moria. Both for the LotR lore aspect, and because a main story with a goal is relatively rare in survival crafting games.
 

I have almost never "finished" a game but I tend to play non story games where your often collecting almost forever.

even Diablo 2 back in the day which I played for years, I think I played a sorc to 98 and 3 hardcore chars to 8x all of whom died 1-1.5 zones from the "end"