It is very stupid to tech straight away you need at elast an army of 8 or more to help creep or whatever it is your doing. BUT.. if you try to tech fast tower or build a couple.. that will help defend a little..
U know what a mate of mine does he rushes with FS and a couple of grunts and holds it will he techs tier 2 then goes back with more grunts and 2 demo's and attacks again and while he attacks he techs he wins solo's in like 10 Min with this strategie

If it fails he get stopped when he harasses he usually already at tier 3 so he getin tauren.. and if hes harassing orc its better cause they all call teh burrows so they get no gold the whole time hes harassing

its a really good strat as im teh victem of this
