A club pro I used to see in the seventies, used to get me to play nine holes with just a five iron. He said there are very few holes that you cannot par with a five iron. For example 3 five irons to a par five is achievable for most people, you can putt with it and you learn to play part shots and shaped shots to get distance right. It is also very good for new players as it takes away the paralysis of trying to choose the right club. Try it some time, it is good fun and teaches you a lot about your swing...