You know who you are. People don't take the time to PLAN things out and they fail. I did this once. Now you need to think about doing a game plan!

A plan really helps because it can help you make a victory in advance!

In co-op, you need a plan. There is a point where EVERYONE IS DYING FOR AN A+ FOR A BONUS! So?! Just construct a plan, like Engineer would! You need to collect all money that falls from robots you kill, so this means Scout would increase fully their Character Stats! The Demoman and Pyro should go for a gaint tank. The rest exept Medic will attack the other bots

There are a lot of plans, but here is one. Scout and other offense classes should go and steal the other teams control points. The defense classes should protect theIR point. Medic should be the main support. Careful, the other team could have planed the same too

There is some thanking along the making of this guide
Thanks to Hebrewman for giving me this idea