Rainbow Mages Worth It?

[modrnangel]

I understand that it can be a bit tough to find magic sites without rainbow mages, but are they worth it in the long term? It seems the only way you can make a rainbow mage is to cripple the rest of your dominion or to have a very physically weak (ie arch-mage, druid, sage, etc.) Pretender.

So, which is it in the long run? I like those extra magical sites but I hate the weak Pretender that goes along with it.