I really want to tell him:"Get Real! It's not an easy stroll down the park!" But out of politeness, I only said something like: "It's actually very difficult. Be able to tell the four tones is nice, but the difficult stuff is yet to come."
Whoever is broadcasting this "simple" language view is being irresponsible. It's so much like the sub prime mortgage borrowers. They don't know what lies ahead of them. If anyone heads into learning Mandarin because of this, he is behaving like an irresponsible learner. The weight, the stress and the complexity will soon crash him out of the learning path.
What is learning Mandarin really like? It's like running a marathon in a very beautiful place. The road under your feet is winding and bumpy and full of obstacles. But as long as you are making the effort on the way, you will be immensely rewarded. The most breath taking scenery will unfold itself. Flying angels will bestow their best wishes on you. It's a path of realizing your potential and doing what you can do with a great amount of effort.
Get real and don't be tricked into learning Mandarin under a false perspective. Be very well prepared.