What they did was to appeal combat medics and pubbers, nothing else...
You dont need dpm as medic, if you are using the xbow and you get it out its because you expect a nice burst damage hit to fend off who is chasing you. This made the weapon completely retarded, might as well just use needles.
As someone above said all they had to do was fix the reload bug and they managed to even fuck that up
Edit: I recommend posting on spuf (there are plenty topics about this nerf) to see if they can reconsider.