As在这里引导的确实是一个表示让步的状语从句,意思是,尽管.AS的这种用法常采用倒装形式,如：
Teacher as he is,he often reads with the students.
形容词exciting后接动词不定式的用法与hard,easy,difficult的用法一种,是一种主动形式表示被动含义.
Its special effects are exciting to watch.
=To watch its special effects is exciting.
=It is exciting to watch its special effects.