
Be nice to the medic(s)!
after a not so fun time on warpath earlier i have to say that. seriously, what the hell is the point of complaing about the medic not healing you when the medic is dead and waiting to respawn? its hard enough being a primary target, it'll just make the medic leave or not heal you. and when there is only 1 medic on your team, cut him or her a break, they are doing the best they can to heal everyone.
Help/protect the medic
even tho they can regen hp (slowly), they cant heal themselves. but they can heal you. take a hit for one if you can, they can heal the damage. if you see or hear a medic call for a medic, that probably means they are being attacked, so if possible, turn around and help him or her. warn if you see a spy coming, they will target the medics when they are not after engie buildings.
Keep moving
as a medic, try to keep moving, even when you appear to safe. the more you move and jump around, the less easy it is for the enemy to hit you. of course you may end up jumping into a crit rocket from time to time like me lol. its aslo quite satisfying whem you dodge the attempted backstab then needle or chop the spy that tried it. also use who you are healing as a shield when necessary
Be "on call"
tho being a personal medic to a single player can be usefull, especially if its a highly skilled one, dont just stick to healing one player. heal whoever needs it if you are in range of them. the more teammates you can keep alive the better.
Always heal
keep working up the ubercharge as much as you can. its an invaluable asset to the team. also, dont be afraid to use it. saving it for the perfect moment may not be always helpfull as you could get killed before you can activate it. its kind of a judgement call depending on the situation, you dont want to risk getting killed, but you dont want to waste it either.
Ubercharging
what you uber can be as important as who you uber, it all depends on the situation. pyros are like psychological warfare, they make em run away. this is especially usefull at the beginning of a round. they are good against large groups and ground based sentries that are close. heavys can be used in the same situations, but are not limited to ground targets and have more range, tho they are not to great at taking down sentries at long ranges (shot spreads out to much). demos are arguably the best at taking out sentries and multple sentries, tho a soldier is also good in a pinch, especially at long ranges.
im probably missing some points, but thats all i think of at 3am lol