Snickersnack: That's a problem. Playable is a matter of opinion. Everyone has different expectations.
What I consider as a playable game is a game that you can still enjoy even with all the graphics settings set to low (or off). You might get a glitch here and there, your frame rate might be lower than what it should be and your game might look uglier, but you should be able to decently enjoy the game.
This is what the mention "minimum specs" should be when the tests are correctly executed. Unfortunately, this is not always the case, and beta testers are often asked to start the game, pass the main menu and see if the game crashes, regardless the frame rate. If the game doesn't crash, then it's good to go.
I sure hope that not all companies proceed this way, but I've seen that countless times.