I found it rather disappointing.

我觉得它相当令人失望。

youdao

This meal is rather disappointing.

这顿饭真让人失望。

youdao

That's rather disappointing.

那相当令人失望。

youdao

Having magisterially analysed the problem, the report is rather disappointing when it comes to solutions.

ECONOMIST: Why equity markets have forgotten their function

Then there is the pollsters' rather disappointing record in some of the key elections that have taken place since 1997.

ECONOMIST: Labour feels confident, but the polls are not to be trusted

There have been a great many arguments leveled against the rather disappointing ending(s) of Mass Effect 3 in the past few weeks.

FORBES: The Better Business Bureau Weighs in on Mass Effect's 'False Advertising'