It's pity that it's not so good as what we (have) imagined是什么意思.

It's pity that it's not so good as what we (have) imagined是什么意思.
It's pity that it's not so good as what we (have) imagined是什么意思.

It's pity that it's not so good as what we (have) imagined是什么意思.
很可惜他没有我们想象那么的好

可惜的是他没有我们想象那么的好，是典型的主语从句。