Why is the Mandarin dubbing animation so ugly?

Judging from the language itself and the environment, Mandarin dubbing has suffered some losses. Because Mandarin has only four tones, it is more difficult to express feelings than Japanese. In addition, with the development of the Internet, the audience has more opportunities to hear the original sound, which is easy to be preconceived and unfair to dubbing Mandarin. Mandarin dubbing is at an unfavorable starting point, and the audience's criticism of Chinese collocation often comes from ignorance. In Mandarin dubbing, there are also many examples that have been rated as surpassing the original sound and widely recognized by the audience, such as the Japanese animation "Oolong Police Station" and the old version of "Hunter".