While that extra amount of ammo wasn't all that balanced the engie thing actually made building placement right the first time more of a skill/game sense thing, where as now they even get a shotgun to heal their building from far away and to pick them up from the same distance :c
And pyro wasn't usless because it's job is to help defend the engies nest from spies. The way pyro stands right now there is 8 different ways I can name right now for the pyro to force itself crits.
1.fare
2.detonator
3.phlogistinator
4.backburner
5. Reserve Shooter
6. Manmelter
7. axestringusher/postal pummeler
8.Neon Annihilator(under water/standing in water)