Well, engis were more powerful in the first days, because of the armor on gloves and high dodge on purple armor.
Then coms and ops found out their own weapons and armor were better.

I believe engis will always be a bit under the other classes in term of pvp, because pvp is based on pure damage dealing, not survivabilty.
On the other hand, we're the most powerful class in pve.
Is it balanced ? Even to me who don't pvp much, nope.