more than有时候为比较习语 comparative idiom. 即more than被用作一个副词。

1 He is more than a teacher.

more than为副词，more than +名词 = not just/not only + 名词。

2 In the course of a day students do far more than just attend classes.

far 可以修饰比较级，用或不用不影响结构。do more than just attend classes = not only attend classes but also do many other things. 或者= do many things but not just attend classes.

3 He is nothing more than a dreamer.

nothing more than为习语，整体按照一个副词分析，= only，exactly。

4 What a governmnet makes of education will decide nothing less than the future of a country.

nothing less than为习语，整体按照一个副词分析，表示强调，= exactly, completely，very.

...will decide the very future of a county.

5 I would be more than ready to help you.

more than+形容词= very，completely。more than分析为副词。

6 Scattered around the globe are more than 100 small regions of isolated volcanic activity known to geologists as hot spots.

more than+数词 = over + 数词。more than 分析为副词。

以上句子均不宜按照普通比较分句来分析。