I usually get top of the list in public servers as the spy on maps like Harvest, Gravelpit and Turbine, and can sometimes get top of the list as scout on gravelpit and 2fort. Only top of the list if the server resets every 2 rounds or so.
Also, things I find funny about tf2 are soldiers that don't know about their shotgun and spy's that don't know about their gun.
Because: Soldiers always see me as someone like an engineer behind them with a wrench. Instead of pulling their shotgun out, they rocket blast, do 60 damage to me, 40 to himself, and he flies away and falls to his death.
SPY'S! Your gun does 60 damage at close range and 20 at long, and has great accuracy. When you see the scout noticed you, dont run and hide, run and shoot him. You should be able to kill him in 3 shots. Yesterday I went about 4 rounds in harvest with only around 10 backstabs in total, and I was 2nd to the top of the list behind a heavy, all my kills were revolvers.