And still people come up with the same stupid idea of healing without even thinking once. Please check the "Medics" thread and read it. Everything has been discussed there pretty nicely. The things that have already been discussed and considered useless are just coming up again here.
So tell me one situation where a medpac is more useful than bandages.
There is just one stance of being injured, which is bleeding. So you don't need a medpack for anything with the current health system which is totally okay, especially as everyone has a bandage for himself and teammates and SL's especially can donate more.
=> 0 use for a healing type medic in FH2. Read page 2 of this or the "Medics" thread for better medic suggestions, but it's only one of those 3 options:
-add some kind of revive
-dump medic kits
-rework health system (which is unnecessary) in order to have healing make sense.