Earlier quoted context omitted.
One example of impressive fansubbing i have seen was where the subs were color matched to the speakers hair, and contained cultural/historic/contextual info.
Matching the speakers' hair is useful, but too often notes end up as showing off. A good translation is supposed to replicate the experience of watching something in its original language, not explain every reference.
A lot of anime is like this: full of dualogue that should be translated as-is to capture the immediacy of a joke or expression, but that has context that doesn't make sense to a non-Japanese without explanation.