I don't think they actually know their team made it in. I followed one in game and asked if he was in highlander he said he wanted to be but isn't. I was going to try and find the link and send it to him but I crashed and now he's offline.
They are fun to play if you're going battle engy and actually succeeding. It's always fun setting up a base near enemy intel that can't be brought down.
Why do they get discriminated against? All the other classes have updates. Also remember that they don't try to make them better, they just try to add a new style of playing them. So it wouldn't really matter if they are fine or not.
Something I've learned about revved up heavies is that their pivot point is not on their head. If you keep turning while your minigun is spinning I would not be able to hit you.
A spy can only get one person at a time. If there are three or more then a backburner would be better than the average spy. I guess some spies could handle a lot of enemies though.