My view is similar to Hobbes'. In a perfect world, every quality would get a comprehensive re-evaluation and potentially recosted so that they're all balanced against each other. But that's not likely to happen, I'm afraid.
Even if that were to happen though... there will always be ways to wring free karma from negative qualities that you know won't meaningfully impact you in-game. Yes, Impaired Attribute is a particularly low hanging example due to the extreme amount of karma you can wring from a dump stat. Personally, I also heartily support house ruling that quality, as well, because of that.