broadly judged还是broadly judging

Broadly judged, the good outweighs by far the evil of the change.

这句话怎么样翻译？其中，从语法上，怎么样剖析句子结构，成分呢？

开头为何不是Broadly judging？

Broadly judged, the good outweighs by far the evil of the change.

broadly judged 为评注性状语，即说话人对句子的注解。

= It is broadly judged thatthe good outweighs by far the evil of the change.

因为后面句子的内容是判断（judge）的宾语从句。即句子与判断是被动关系，所以要用过去分词。

翻译：这种变化利远大于弊，这是总体判断。