What rank of it do the majority/best of you choose usually on your G'hern? Any insight on how you decide?
I like to have at least rank 2, rank 3 isn't worth it IMO, but you could probably get away with rank 1 on a melee overseer if you prefer a heavy melee based style, like with savage boars and moga hunters perhaps. But I would suggest at least 2.
Level 2 is the best option since you won't keep your moga too far away from your G'hern for a lvl3 to be worth. So save the 2 nora
I do rank 2 most of the time, mostly because the majority of gherns that I run are also in my Cultural Contamination deck, and you NEED overseer 2 for that deck. Of course, outside of moga I run a couple (general and thrower), and in those I drop it down to overseer 1
I disagree. A good amount of them are superbly costed atm and will probably eventually need a cost hike