For the language alone, I dislike 量词(liàngcí,classifier) and the looseness of grammar in writings(However it is a good factor in colloquial), along with deficiency of special characters like Japanese hiragana for grammar usage.

There are also numerous homophonous syllables, like 话梅(huà méi) 画眉(huà méi,).Thrush a kind of bird

There are so many Chinese dialects; Taiwan, Hong Kong, and Mainland share different characters (Traditional characters used in Hong Kong and Taiwan; simplified characters used in mainland)

thank you !

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