The whole "unplayable" notion is a bit hyperbolic, but I totally get the sentiment. I've always been a console guy but have found gaming on my PC infinitely more enjoyable in the last 2-3 years, so much so I ended up building a new machine and unplugging my consoles for good.
The real turning point for me was Skyrim.
I originally bought it for the 360 as it was my go to platform. I played it for 20 hours and really struggled with it. It wasn't until I haphazardly bought it on my PC on a steam sale that I felt like I was actually playing the game. It wasn't just the graphics (even though the boost in fidelity was significant), but the load times. Instead of walking into a room and waiting for what seemed like 20 seconds, on PC it was almost instant. This changed the game for me and made Skyrim a pure unadulterated pleasure.
I get why it pisses people off when a PC guy is all like "f*** dem consoles", but to be honest, f*** dem consoles. The imminent next gen is the first gen where I don't buy anything, as oppose to everything.
Well, all that matters is you enjoy your time with it, regardless of the game.
Though I only tend to reply arcade style games that are mainly mechanics based, like puzzles, fighters and shumups. I find it really hard to go through massive narrative based games that demand a lot of time, I just get bored half way through.
This generation I've probably replayed geometry wars and l4d more than anything else.