here's the thing melee has a range of .5(fork) - 3(spear) meters. you can simply evade or get out of their range, and the scout is devastating from a pro within 10 meters of range. Given that the scout has high damage and speed, you can attack and evade, killing the enemy before they kill you.
Hmm, I guess the 7 meters of increased range is a benefit. But why would you use scout for an enemy above 10 meters away? Assault can do a heavy amount of damage, and if the enemy gets too close, you can always use melee to finish them off.
Unless you are really good with scout, and have used it instead of other classes, then yeah, it would make sense. Especially if you are a pro at flag grabbing.