美中不足
[词典] beautiful yet incomplete -- in want of perfection; a blemish in an otherwise perfect thing; a flaw in an apparently perfect thing; a [the] fly in the ointment; a fly in the ointment;
[例句]你的新工作听起来实在太好了--工作有趣味，待遇高，时间短。有什么美中不足的地方吗？
Your new job sounds too good to be true--interesting work, high pay, short hours. Isn't there any fly in the ointment?