Eric at The POW Block says: "I have noticed ever since around 2006-2007, when I got my first Xbox 360, that game demos have most always been the best 10 minutes a game can offer. After that the game can either fail or turn out good. Ever since I purchased Gamefly I have always been inclined to try the demo for the game I was about to receive. The reason is because I wanted to know if the demo portrayed the game correctly. In most cases it did not."
Many of the users are taking the 3/16th rule as time only. This is not the case. For most single player games 3/16th of the game would be 1 complete level and (if it's a shooter) 3 or so of the guns. The rule just means 3/16th of the content divided however the devloper decides will best repersent the game.