Worst one I have heard without being highly controversial.
"Real players use the AWP; it takes more skill than the Scout"-Look at the stats.
More controversial, TF2 ones.
"Scout is easy"-My only exception to this being completely wrong is when the scout uses his stupid update weapons, notably the sandman.
"Sandman is a good weapon"-Lets trick the guy into thinking I'll melee just to snipe him with a melee weapon and then shoot him with my FAN, see I can melee heavies like they are flies. I must be awesome.
"Force-A-Nature is Pro"-Pull out your melee weapon against a FAN wielding scout, 90% of the time, even if you are also a scout, he will run away to reload, unlike scattergun users who know how to play."
"Soldier is hard to learn"-Rockets fly straight, its hard to master but it is easy to play"
"Demoman is easy because its just a spam class"-The best demomen don't use the sticky gun.
"Spy is easy"-Spy has one of the lowest KDR's.
"Engineer's sentry guns are for noobs"-Sentry guns are easy to defeat when you have a brain, but since most people don't they make a great backbone of defense.