Builder is really not good when it comes down to it. It seems good because it has so many perks, but when it comes down to it you don't use them. I personally prefer Destroyer.
what're you talking about, builder is practically god tier
at level 42 you get the ability to macro or import any loving build you want
i insta'd the final boss, third-rollover, by dropping one of my loving castles on him
EDIT: alright yeah you're right builders are actually pretty decent but BY GOD they're loving fun