That is quite a nerf to the engineer. The main problem now is nova and having no inventions the other rounds.

From the changes it looks like the engineer will now need to buy a weapon (probably ranged) unless they take a gun invention. This could be a positive thing, as before I don't think I really used any of the engineers weapons, just his bombs and things.

This makes the engineer more a rouge with a couple of tricks up his sleeve but with less damage output. Whether this balances with the other classes though, I'm not sure.