Anything is possible.
Why finish something that's such an apparent and painful chore though? I've never finished a game that sounds as unpleasant as OP describes MGS as.
Unless you wanted to write something controversial about it for kicks and reactions...on say...a video game forum.
Hardly. I beat several sections in Knight by dropping down and stealth takedowns. No fancy technique even needed.
You can if you want for points, but you can cheese them easily.
Same reason I don't walk out of a theater just because I don't enjoy a movie. I like to finish things and give it a chance.