Games are played for the experience. You should be having fun the entire experience. If I'm playing a game and it stops being fun to play I simply stop. I have no qualms of leaving it unfinished it if I'd have to trudge through the rest of the game. I only made it halfway through half of my rpgs I own. I got tales of the Abyss for 3ds and after 20 hours I'm getting tired of the gameplay and the story and am about to quit.
I've quit games a level or two before the final boss which is what happened when I played Fire Emblem and Trauma center. There are some games I'm able to play through for hours in one sitting since the entire time I was having fun like Chrono Trigger, FF 7 & 9, Uncharted, Red dead redemption, and the entire Resident evil series.
If games aren't able to hold your interest to the end don't blame the yourself it's a problem with the game. No need to punish yourself by forcing yourself through it.







