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TF2 used to be so much better before they shifted their focus from the game to items. Going free to play is killing it too (for me, I'm sure it's amazing for Valve). So many fucking idiots playing now :(
 
Back then:
Demos, flank them using grenades. Hold the stickies for ubers and use the explosion force to push them back
Snipers, counter-snipe the other snipers. Make sure you cover each other's bases.
Medics, heal the demos and heavies when they need it. DO NOT use the ubers unless absolutely necessary.
Scouts, run ahead and report about any hidden sentries. Also, disrupt any potential engineer building.

Now:
STOUT SHAKO: 2 REF.
Medics pocketing heavies and using ubers before the round even starts.
Snipers counter-sniping with the Huntsman.
Demos spamming grenades and stickies in a haphazardly order and blowing themselves up.
Scouts trying to take down a heavy medic combo.
 
I love playing Vanilla, but it happens quite often that a server loses connection to the item server, so I have enough opportunity : )