The one thing I find bullshit about phlogs is that the crit taunt fully heals injured pyros afterwards. So I'll be in a situation as soldier where I unload 2 rockets on a phlog pyro coming at me, then he taunts before the 3rd rocket hits and at this point I only have one rocket (nowhere near enough to kill a full pyro) so I have to either use it to rocket jump away or die to the phlog. It's just frustrating that I have to make an effort to escape from what I initially thought would be an easy kill. I understand the invincibility while taunting but the full heal afterwards is just ridiculous since it encourages a cheap, kamikaze tactic for pyros.
Its no more or less cheap than a lot of other cheesy weapons. With things like the beggar's bazooka and the machina I really don't understand why Phlog is always the single target of hate. I don't use it, and giggle at people who do, but I think it's funny it actually makes people rage.