חבל על הזמן
khaval al hazman
literally "a shame about the time" — used for both amazing and terrible things · idiom

A phrase that flips meaning entirely on tone: said with excitement it means "unbelievably good", said flatly it means "what a waste of time".
האוכל במסעדה הזאת — חבל על הזמן!
“The food at this restaurant — khaval al hazman (it's incredible)!”
What is something you would genuinely say khaval al hazman about — good or bad?