I wouldn't say that one shouldn't start out taking macro pics with this lens! Depends if you're up for a challenge, and have patience.
You definately need lots of patience, and be the kind of person that likes nutting out how to use gear, rather than just expecting it to be easy, because this lens is not.
However, if your idea of macro is 1:1 and bigger, and you are comfortable with the idea of a manual focus lens where you have to move the object into the focus area of the lens, rather than focusing on an object....then go for it! You really will need a macro flash to use this lens at 1:2 and greater magnifications, I lasted a week without a flash. Everything is too dark - the lens eats up the light.
If you are very steady, it's possible to use this lens without a tripod, but for greater magnifications, you'll need one, because the DOF is so thin.
This lens cannot be used for anything other than macro - because the lens has fixed focus points (probably not correct terminology) depending on the magnification. ie, you won't be able to focus on that car driving by. You also won't be able to fit anything other than small objects into the frame, even at 1:1. No roses, big butterflies, whole lilies etc - all too big. But you can photograph their pollen grains....
If you want the other kind of macro lens, that is 1:1 or less, I'd recommend the Canon 100mm macro. This one gives you a bit of telephoto - distance between you and your subject such as butterflies, which would fly away if you try and use a shorter lens such as a 60mm. The 100mm has great IQ, sharpness, is easy to use, and can be used for non-macro stuff too - such as portraits, landscape etc.
I've got both, and plan to keep it that way, as what you can do with one, can't be done with the other. Try fitting a whole large butterfly into the MP-E field of view! But then you can create high magnification images with the MP-E.