Understand that 'damn with faint praise' subtly suggests disappointment or disapproval rather than outright condemning. Her performance was called 'competent,' damning it with faint praise.
Pro Tip 2/3
Sarcasm Sense
Be aware that this phrase can be sarcastic, implying the opposite of the praise given. He's 'remarkably average,' she said, damning with faint praise.
Pro Tip 3/3
Cultural Nuance
In some cultures, direct criticism is rude, so this phrase is a polite way to express a negative opinion. Your idea is 'interesting,' he said, damning it with faint praise.