ill play anything and everything only problem is im no good at engie spy or sniper, as for the medic, it can be a hard thing to do, at least being a GOOD medic is hard, your a main target by most intelegent players and spies just love to back stab you, you have to watch your groups back, and it takes skill to keep 2-3 people alive wile advanceing. Checking for peoples hp to see if they need healing with out them yelling at you takes work as well, figureing out who needs to be healed and who dosnt can take some thinking as well. And having to watch people to figure out who is worth ubering is also a task that is required by good medics, and buffing a groups hp to help them out can be tasking work as well
but just being a medic is simple, point and click heal the people who want your healing or just heal the heavy like some medics do, but as with all classes being the class is simple but to do really well with it, you need to do alot of extra work