Removing the Uber stun makes the bat entirely useless since stunning someone gives them so much resistance you cant kill them before they come round at point blank anyway.
Not really, Gizmo.
The stunned player now takes 50% more damage than it used to. Let's look at it like this:
As a soldier I can fire a full blast of four rockets doing somewhere between 420 and 448 HP worth of damage on direct hits without crits (Source). Hitting a stunned opponent this works out as 315 to 336HP worth of damage. Then I can just switch to the shotgun and finish even a heavy off. That's not including fire from your team mates.
You could try teamwork!
thats wrong... he takes 75% of the damage he would usually take ... its just he used to take 50% and now its 75%, sillybuns!
so with a FAN thats about 150 P.B.A.D (Point Blank Accurate Damage)