I suppose EE is probably overpowered when you compare it to other mods, but honestly it could be a lot worse. In tekkit the mod's best (and most expensive) items have horrible bugs which render them useless. For example, Redmatter/Darkmatter/gem armours don't provide any protection and allow you to get killed very easily when worn. Another example is the Pedestal, which simply doesn't do anything due to a similar bug.
In any case, I hope EE doesn't get removed from tekkit as honestly it's a b**** and a half setting up a server & client every time I want to play a new EE update with my friend.