GrambottleI don't see what the big deal is about the wrangler. A wrangling engie is an easy pick for a sniper or spy most of the time; otherwise you just need to focus the engie instead of the gun and then take it down. If you're ubering into a wrangler, if the gun is in a position where the engie can hide behind it then pack a demo to sticky the engie. Just pick the engie somehow and get on with your game. :P
Alternatively, coordinate with a spy sap or a cow mangler charge (it ain't banned in UGC, lol).
as I've said a billion times
it's not about how hard it is to take down the wrangler, it's about how easy it is to defend when the entire enemy team is focused on one class + an inanimate object, leaving you 8 guys with perfect health and ammo to destroy their team at the end of the fight