Never Really Played a Good Singleplayer Game

Dragonfall - Director's cut.  Fantasy Cyberpunk hybrid.  This one does read like a novel - and the turn based combat is fun too. 

hotline miami is a great game

ME3 has an option where you can have a more storied experience, and was way better than ME2.

Although if you want a true RPG go with the original ME which had the most amount of technicality about it. More planets to explore than ME2 and a much more open feel considering many of the planets aren't just a closed off level; adds to the realism.

Did someone say KOTOR? Awesome.

People still play Diablo II bc III is shit.

And hit up the modded Morrowind too bc that stuff is sick. And.. And! Check out SWG EMU just because!

Dude! MGS is on PC! 

http://www.amazon.com/Metal-Gear-Solid-PC/dp/B00004VP4B

http://www.amazon.com/Metal-Gear-Solid-2-Substance-PC/dp/B00008JPTK/ref=sr_1_12?s=videogames&ie=UTF8&qid=1421120165&sr=1-12&keywords=MGS+3+pc

i love to play diablo2 me and a few of my friends play it all the time, diablo 3 sucked because they made it too easy it was kind off a game that had console feel where you pick it up play it for 5 minutes and you are satisfied with it

StarCraft 2. I think it has the best campaign I have ever played. I actually read the books and fan fiction. I love this game. The multiplayer is fun, but REALLY hard. Just play the campaign.