
Damn somebody/something with faint praise
Subtle Criticism
Understand that 'damn with faint praise' subtly suggests disappointment or disapproval rather than outright condemning. 
Sarcasm Sense
Be aware that this phrase can be sarcastic, implying the opposite of the praise given. 
Cultural Nuance
In some cultures, direct criticism is rude, so this phrase is a polite way to express a negative opinion. 