To imply condemnation of someone by praising them for utterly unimportant details. From Alexander Pope's Epistle to Doctor Arbuthnot (1733): "Damn with faint praise, assent with civil leer, and, without sneering, teach the rest to sneer."
Damn with faint praise:
One thing you can say for the force that invaded Iraq, at least they kept their uniforms clean.
Among statesmen of the twentieth century, Joseph Stalin truly and undeniably knew how to trim his moustache.
The Creationist propaganda movie was recorded on what were physically some of the finest rolls of film I've ever watched. As for the arguments and evidence recorded on them, well ...,
From Batman (1989):
On the other hand he had a tremendous singing voice.
As has been mentioned, a way of agreeing with something, but I always found it to be almost condescending (in a cool way.) It seems like a "grown-up" way of saying "duh" almost.
John McCain: I'm a conservative but even I think our former president was a bit of a fuck up.
Something Jayne Cobb from the popular TV show Firefly would say if someone told him how awesome his hat was.
Kaylee: I think it's the sweetest thing ever.
Wash: A man walks down the street in that hat, people know he's not afraid of anything.
Jayne: Damn straight.