No, CNNIC is not even trustworthy among Chinese Internet users.
CNNIC invented tons of rootkit adware and spyware. It has a very bad reputation. Google for 3721 中文网址 if you are interested
Although it claims to be a neutral non-profit organization, it does have multiple for-profit business lines.
In the past CNNIC belongs to China Academy of Science, but now it's just a puppet under ruling Party's control[1][2].
[1]: http://en.wikipedia.org/wiki/Central_Leading_Group_for_Inter...
[2]: News in Chinese http://tech.gmw.cn/2014-12/27/content_14311910.htm