Jumping as a scout has it's uses, but what Kuro is saying is that you don't want to jump for no reason. That goes for any class, but Scouts tend to do it more than others. jumping makes predicting where you'll be a lot easier than strafing and juking does. Generally, in combat, you only want to use the double and triple jump to trip up your enemies.
For Soldiers and demos, to make them shoot where they think you'll land, then using your second (or third) jump to change direction, making them miss their shot. Much like airblasting, it's much harder to do against good players, because they won't get flustered in combat and will just wait for you to exhaust your jumps (or, if they're really good, airshot you).
For heavies, jumping over them can sometimes work if they're terrible at aiming. Most even semi-decent heavies will track you the whole way though, and you'll be torn to ribbons. It tends to work best when you meatshot a heavy from behind and then jump over him as he turns around. It can give you the edge you need to get in those two extra meatshots to take him down, but if you're not used to it, it'll hurt more than help, because it will throw off your aim.
s are all messed up. Also, you tore shit up on Thunder Mountain. Also penis.
