Building a scout on any level is bad (unless you don't have horses maybe). But starting with a scout may occasionally be better than a warrior, and a lot of the time only slightly worse. Sometimes a warrior can't quite scout quick enough (goes for starting location too). It is annoying that Firaxis seems to have considered starting with a scout compensation for hunting. Stupid huts.
On a related note, I've never quite managed to figure out how significant meeting other civs is for the passive tech advantage. Maybe that's another small situational argument for scouts.
Anyway, I'm arguing a very minor point that the hatred towards scouts should be slightly milder.