You can critise someones work by wording it such as "i disagree" or "I don't belive that personally" rather than "its rubbish" or "you are wrong". To cheese's defnece the razorback is not a total waste of time at all. The idea that the ambassador makes it useless doesn't make any sense. Ok suppose your playing on pipeline in the stage with the tunnel in the bottom. I'm surrounded by 10 teammates and im a sniper. Timeline one withour razorback: Spy stabs me and instantly claoks or uses deadrigner to get outta there. I'm dead. Timeline two with razorback: spy trys to use ambassador or tries to backstab me, instaly revealing himself, nearest demo stickies his ass, or medic saws his face off. The razorback ins't suppsoed to save you when your on your own and standing still, its supposed to a) buy you time in some situations or agaisnt bad spies and b) stop them from using hit and run when your in a group of allies.
And another peice of adivce, find a wall or obstical to hide behind, full zoom in still behind then use direction keys to edge out, snipe then edge back in.
Also don't forget a full charged shot to the head kills a heavy being healed or not, and often if being healed they move slow as they have thier gun wound up.