» Sat Oct 16, 2010 3:42 am
The answer to both (and to Engineers buffing their guns, if anyone was wondering) is that you can give yourself ammo/health/buffs, but you can't heal yourself as often as you can heal your teammates, and you don't get XP like you do when you help teammates. This way, you have a strong incentive to use your kit to help teammates and rely on them to help you, but your class tools are still useful when you go solo.
PS: My memory's a bit fuzzy, but they've talked about an unlockable skill for Medic that would allow them to revive themselves when incapacitated. You wouldn't be able to use it too often, and you'd have to give up another skill for it, just like for any unlockable skill.