Do you think servers will turn on friendly fire any time soon? Doesn't seem right without it.
Because there is no worry of killing your team (and losing points), people are going mad with demomen and heavys etc etc, I't be a much better game with FF - people may actually think more about what they are doing!
Too many people are afraid of dieing, the battles on 2Fort for example seem to be happening right in the front door rather than the briefcase area, because rarely people are making a move inside. In actual fact I don't think I've seen any real defence in the flag room!
So...FF on, Scout tuned down, Engineer's shotgun tuned down...and I'm happy