I find upgrading to priests rarely is a helpful move. I find they tend to be cannon fonder for the enemy unless babysat. The problem arrises due to the amount of gold they are worth.

Archers are worth 33 experience and 8 gold

Priest 50 experience and 33 gold

I understand the increase in experience, they are a bit harder to kill, but the increase in gold is enormous. But the gold is crazy. About 3(thanks for info transiitive, i forgot) come out each wave, greatly increasing the amount of gold an enemy kills for destroying that wave. I believe their health and damage are not indicative of their worth in gold. The priest upgrade is a bit counterintuitive because it rarely is a benefit to those who bought it, but instead an upgrade to the enemy. When it's almost a necessity to tell your allies not to purchase an upgrade before the enemy, i think there is a problem

I understand there was another thread about this, but the original post really seemed poor imo. I think frogboy even reffered to it, describing it as something that "discourages developers from reading through the forums."

So here is a new thread where I hope we can stay on topic (obscenitor and woca)