I'm sorry. It's just the fact that the medic class is meant for healing. You can't give a class with 300 health the power to heal other classes. Not to mention that all mediguns heal the user.

Three Hundred Health + Health Regen + The Power To Heal Other Classes = RIP This Game

We all hate heavy medic pairs in our bases, right? Well how about a heavy medic pair where the medic is a heavy with regen, a medigun and a powerful weapon (shotgun) ? This is hell right here. I'm sorry to put you down like this but it's the truth.