Wildling Allies tech is so far into the tech tree (unless you really try to rush it) that when you finally research it Trolls, Ogres, Darklings or Wildlings are so pitifully weak even against other monster armies that they are simply a waste of time. I had a Darkling Shaman almost single-handedly destroy a group of 5 trolls and two ogres.

It would be nice that those settlements (or lairs) are upgradeable (maybe put the upgrades in the tech tree later, and basic tech earlier). I mean, it's great to have troll or ogre army but right now they are simply useless.