A pure scout rush doesn't work, at all. 8 scouts will lose to 3 or 4 light frigs. Scout rushes in this game are a stalling tactic. Now, if the opponent is stupid enough to make the long range frig, then yeah, scouts will tear them apart, but the light frig counters the scout so well and it's so cheap, there's no sense in a pure scout rush.
What DOES work is targeting the shit that only the scout is effective against and then running, because nothing will catch a scout except for fighters and bombers. Constructors are the ideal target, those and colony frigs. You can impede your opponent's progress so much that he can't do what he wants to effectively.
Throw in the bomb ability with the TEC with an LRM spam, and the scout rush tactic suddenly is a viable option.