Out of this world = extremely enjoyable or impressive.
- What a restaurant, the food was out of this world!
- The performance was out of this world!
- This bakery sells some out-of-this-world desserts.
Like gold dust = something very difficult to get because a lot of people want it.
- Tickets for the concert are like gold dust.
- You can’t get those new trainers anywhere. They’re like gold dust.
Leave a lot to be desired = be highly unsatisfactory.
- Apparently, her cooking leaves a lot to be desired.
- I’m sorry to have to fire you, Mary, but your work leaves a lot to desired.
The lesser of two evils = The less unpleasant of two choices, neither of which is good.
- People voted for him as the lesser of two evils.
(i.e here both the candidates are unsatisfactory with slight difference)
- I was offered the post either as a typist or office clerk. Aptitude-wise both the jobs didn’t satisfy me, but I chose the post of a typist as the lesser two evils.