I don't get why everyone is complaining. Valve can easily be like every other company and not do any updates at all, keep the price at an even 50 until no, but no until Friday it's only 10$. Valve doesn't f*** around, of course they have playtested it, Scout is a class that changes much player by player, the fact that they could find things that well was to me a little surprising. The ideas of all of them are a little daring although if they really screwed up as much as you are saying they will fix it, they always have. Once all of the packs are out wait a while, a month or two, they all seem to fit into the TF2 universe.
Up until the pyro weapons came up pyro to me seemed like a boring and unstratgistic class. All the new weapons solved that for me, and added almost dozens of ways to run into a situation. The whole thing about the new weapons is to have more options.
Now for all of you little whining bitches saying that the new weapons suck, I am sure some has/soon will make a mod disabling them for servers.