There have been several games I've been unable to finish, even if they're good and I've invested 30+ hours into them.
Usually I don't go back to those games again, but some times I do, after several years have passed.
After several years it seems easier but when it is in the same generation or even a year or two apart it is so hard to justify restarting and still a pain to try and shimmy back into mid game. I feel ya..
Everything in the above reply is my opinion, from my own perspective and not representative of reality outside of my own head!
-Android user, please be gentle with critique on my spelling.