Edit: I don't know about you, but I totes spend more than 15 minutes when playing a game.
When you do get a bunch of games, you tend to not tolerate the BS in games you get agitated with.
But lets say it's a game like Super Ghouls and Ghosts, you die in the first part. And then...you die again in the first part. If you had around 50 games to play, you might try one more time and then move on.
Unless it's something retro like Lunar or Chrono Trigger, than yeah you'll spend more time with it. But any compliation I have played, like the Sega Genesis, I play through the crappy games and then off to play the RPGs.