I could go on and on, but I figure if the reader has bothered to read this far, I’m preaching to the converted, anyway. Those who have tackled other difficult languages have their own litany of horror stories, I’m sure. But I still feel reasonably confident in asserting that, for an average American, Chinese is significantly harder to learn than any of the other thirty or so major world languages that are usually studied formally at the university level (though Japanese in many ways comes close). Not too interesting for linguists, maybe, but something to consider if you’ve decided to better yourself by learning a foreign language, and you’re thinking “Gee, Chinese looks kinda neat.”
It’s pretty hard to quantify a process as complex and multi-faceted as language-learning, but one simple metric is to simply estimate the time it takes to master the requisite language-learning skills. When you consider all the above-mentioned things a learner of Chinese has to acquire — ability to use a dictionary, familiarity with two or three romanization methods, a grasp of principles involved in writing characters (both simplified and traditional) — it adds up to an awful lot of down time while one is “learning to learn” Chinese.
How much harder is Chinese? Again, I’ll use French as my canonical “easy language”. This is a very rough and intuitive estimate, but I would say that it takes about three times as long to reach a level of comfortable fluency in speaking, reading, and writing Chinese as it takes to reach a comparable level in French. An average American could probably become reasonably fluent in two Romance languages in the time it would take them to reach the same level in Chinese.
One could perhaps view learning languages as being similar to learning musical instruments. Despite the esoteric glories of the harmonica literature, it’s probably safe to say that the piano is a lot harder and more time-consuming to learn. To extend the analogy, there is also the fact that we are all virtuosos on at least one “instrument” (namely, our native language), and learning instruments from the same family is easier than embarking on a completely different instrument. A Spanish person learning Portuguese is comparable to a violinist taking up the viola, whereas an American learning Chinese is more like a rock guitarist trying to learn to play an elaborate 30-stop three-manual pipe organ.
Someone once said that learning Chinese is “a five-year lesson in humility”. I used to think this meant that at the end of five years you will have mastered Chinese and learned humility along the way. However, now having studied Chinese for over six years, I have concluded that actually the phrase means that after five years your Chinese will still be abysmal, but at least you will have thoroughly learned humility.