I don't think much of her idea.

我认为她的主意不怎么样。

To tell the truth, I don't think much of psychiatrists.

说实话，我认为精神病医生不怎么样。

I do not think much of apples.

我不太喜欢苹果。

I don't think much of his idea.

我觉得他的主意并不高明。

I don't think much of the film.

我认为电影不怎么样。