I guess it'll be that way untill they upgrade the other classes.. The flare isn't that powerful, it does hardly anything to sentries and as long as there's some nearby health to stop the burning again, it is just an annoyance. The burning lasts for ages afterwards, this is my only gripe, it does like 100 damage over time.
I'd agree that getting into flamer distance suddenly your chances of living are like 20% so your only chance now is to kill them first and hope there's someone nearby that's sensible enough to be a medic to stop the burning.
edit: I'd say the classes are becoming more defined with these updates as previously any class could be used to assualt with. Each had it's perks but they were sort of samy in comparison to TFC. I suppose some of this was brought about by nerfing the heavies moderate damage at a distance and boosting the scouts damage output. A scout was pretty much ONLY a flag runner and now he's a contender in any gun fight. Now, each classes roles are being emphasised.
The flare gun is like a redesign of the napalm rocket launcher. It feels a lot like the old TFC pyro now. It's certainly not as overpowered too the shotgun as the new syringe gun was.
You're exagerating, It doesn't make 100 over time. I've been playing as Scout, beeing burned tons of times without dieing.
Pyro isn't overpowered now, it's just fair. It has been the 2nd less played class, I've been using it for months, it's a very hard class too use, with updates or without them, it's hard. You think they are overpowered just because all servers are 70% Pyros, so you've been killed all the time by Pyros. Just wait some weeks before saying it's overtweaked.
To the edit: I haven't played TFC but yes, I think they're tweaking the classes so they are good at where they're supposed to be good. Now the Pyro is a very good close range class, It wasn't before.
And i rather prefer the shotgun than the Flare Gun. Flare gun only makes like 20 damage, I think shotgun is far better, you can burn the enemies and then finish off them with the shotgun, you can't do it with the flare gun.