Honestly I don't see the axe as hurting Medics as much as making up for the fact that Pyros absolutely can't touch them under normal circumstances.
The shotgun is just silly, but there are already three good engineer shotguns so you don't have to worry about seeing it too often. Besides, if it's anything like the other rayguns you can just step out of the way at MEDICSPEED.
But haha oh wow that new comic. The new knife and bat might even be useful!