I personally played a lot of scout, and got really good at it, that means very annoying.
Scouts scatterguns are good no doubt, but the best ways for me is the personal add from the FaN that you can stop movement or atleast take out control of the game of the other player,
this is vital for taking out some of the better players, and totally confuses the newer players.
Also medics who got hit once by the fan and go into the air wont hit their uber usually since they think they can still run a bit further to activate the uber at the right place, but the second hit after airlauch is way stronger since you can get so much closer with more ease, bam, there goes the uber and the guy runs into sentryguns.
Also the jump of the FaN is so perfect for the scout to get out of troube, I use it so much that usually I have to resupply the fan competely after just running around 2-3 min lol.
And as well as goes for the sandman, it is a supreme advantage to take out control of the game for the other player, but scout is more of a hit-and-run class, after 1 ball if you miss or hit there is a change that another players is there too, don't get yourself is too much danger with already loss of health by the Sandman, I prefer bat more, but I hardly ever use it.
Also have bonk equipped instead of pistol, it favors my style a lot more when you are for example behind enemy lines, if you got boxed or something, pull out that drink and pretty much saves your life and if you are really sneaky use it to run in front of soldiers and demoman, it causes damage since they explode right in their faces
