People are creatures of habit and envy. What someone else has, we want. So when you see your friends leveling their characters at an amazing pace, you begin to ask... where can I find a fast leveling guide so I can keep up?
There are plenty around. Some are free, others you must buy, but they are not all the same. Each one has its benefits and downsides that you have to keep in mind before you make a commitment.
There are a few free guides floating around the internet, but they all suffer from one major problem. They require you to tab out of the game to find out where to go next, or play in windowed mode reducing your screen size.
They also typically rely on a free add on to enhance them. This add on is good, don't get me wrong, but it has one major fault. It shows you EVERY quest destination. It is also prone to breaking, and it is not uncommon to have it not remove dots on your mini-map as you finish quests (it is also not uncommon for those dots to carry onto your other characters).
You should not have to be a hunter, or rely on friends, in order to reach the level cap. But, many guides on the market were designed by hunters, which makes it difficult (at best) for some classes to complete the guide.
There are plenty of hunters in the game (some would say too many, LOL), so there needs to be a guide that any class can use. The game can always use more healers and tanks, and a fast leveling guide should keep them in mind.