Melee and pugs

Would you use the bonesaw or ubersaw in the 6 vs 6 format (no crits)? Keep in mind that the pugs generally have a much lower factor of amateurishness and all around stupidity and are often filled with division 1-# players or equivalent of. Should you simply stick with the ubersaw and hope for the chance to ninja some uber on someone with their back turned to you? or should stay away from melee all together considering that pug players are generally half decent/pro players and use bonesaws extra speed for when you have no better options?

The saw (uber or bone) should only be used in an emergency. In 6v6, a medic is critical to the team's success, so your #1 priority is staying safe and staying alive. Use your ubersaw only if forced into a situation where you cannot run away. Otherwise, you'd be better off running away, using the blutsauger to score some extra hit points that may help keep you alive longer. You should avoid being a battle medic - that one easy kill you score may leave you vulnerable to being killed by another player who comes along while you're trying to saw the other guy.

Given the choice, I always equip the ubersaw.

Ubersaw.  The 20% slower speed doesn't offset it's bonus of 25% ubercharge.  I'd only use it as a last resort - or when I think I can get a swing or 2 in on the enemy without them knowing (ie, Spies running away or Snipers in scope)  After 2 swings, I automatically run away and finish off with the SG.  My chances of survival are a lot higher if I don't stay there swinging away.  I never go actively looking for a fight unless I spawn with enough classes that don't actively use Medics (Scouts, Spies, Snipers)

Actively going in for an attack to quick-charge the uber more times than not ends in my death (rightly so - a Medic cannot withstand most classes attacks)  He's more than capable to top the charts as MVP by assisting alone, and that's where he excels.