I decided to play casual some time ago because i wanted to try it out.
It was a beautiful day on 2Fort. There were only 2 snipers maximum. However, we had motherloving 6 scouts. I decided to play medic because he got buffed for the scouts.
Turns out, the scouts all ignored the medic and did everything to make it worse for him.
And then... The ultimate sign of being a noob...
...They all ran into sentries. There was one decoration clad pro looking spy, guess what he did to a sentry. If you guessed running to it hoping the medic has a ubercharge even if he did not so he can knife it, you are right!
TL;DR Casual Mode is full of idiots.