IMO they nerfed the wrong thing....the compression blast should have been nerfed or made to build up like an uber. When a pyro can blow you 20' into the air then it makes me think that is the item out of whack. 50 hp helps but losing it is not the end of the world. The blast unbalanced the game. A demo can disrupt an uber with stickies but would have a very hard time disrupting the entire uber as they have long load times for ammo, same for soldiers. A pyro can disrupt the whole uber easily especially if they are near a dispenser.
Many players like this change so in the end that is what these guys are paid to do: customer service.
Adapt and overcome!
Pyros being able to blow you 20' into the air is probably one of the few good things they have going for them.
Lets look at the facts about being a Pyro.
Pros:
Fast walking speed
Extremely good at ambushing
Most people will fear you because you can set them on fire
Shotgun finishes off those who are just out of range of you flamethrower
Axtinguisher is an awesome melee weapon for in close combat but still most people will kill you because of armor
BackBurner is STILL an awesome ambush weapon, -50 Hps just separates the cannon fodder from those who actually have some knowledge of why this class was made
Cons:
Light Armor, so you're still Heavy bait because a decent heavy can still outdamage a Pyro in close combat with few exceptions
Majority of people used to only use BackBurner because they thought "OMGZ +50 HPS IS MAKE ME GODLY LIKE WOWSZZZZ", I make special note because I like to be specifc and I don't want to offend particulars.
Range still murders you because of your HPs and Armor rating, which made most people skeptical about playing Pyros instead of Soldiers or Demomen.
Armor and HPs are the worst thing about Pyro and nearly trumps all it's good qualities though in the end
So I still don't see how they made them unbalanced with the Compression Blast, I mean I play on the goldrush server all the time and the times I see someone use Compression Blast to keep an Uber away let alone even know what Compression Blast is, is few and far between. I see your point of view and recognize it, I just don't know really how you came to it that way given the facts I just pointed out. Then again its your opinion and you are very well entitled to it.