I would like it personally, I dont think the Iroquois people were equals to the Huron in the east and the Mississippian tribes to the south and the natives of the plains to the west, they may have had some important roles to play in the New World but their largest cities were, and still are hiccups compared to the other nation they share a stage with. I dont think the Iroquois are at best worthy of City-State when compared with other civilizations reduced to city-states by CiV V or not even mentioned (Brazil, Zulu, Poland/Prussia, the Hitties, Carthage ect).
I am unimpressed with the Iroquois culture to be completely honest and I think if you include them as a major nation then you must be scraping the bottom of the barrel because this culture produced no great wonders, had a though time with their neighbouring tribes, were hopelessly behind in technology and were essentially the English empires economic slaves in the same way the Huron were the French's. There are more impressive Canadian natives like the ones from British Colombia (west coast) which carved some magnificent totem poles and had copper shields and much more impressive homes which had wooden planks for building material. The Iroquois were devastated just as quickly as all the other native tribes after they helped conquer Quebec City and were sent home with the gift of smallpox from the English forces (a few immune soldiers cut up blankets with the smallpox spores and packaged them in boxes for the Iroquois...the English even had the nerve to tell them not to open the boxes till they got home, so that the British who hadn't been exposed yet wouldn't get infected)...Something I personally think is a crime against humanity to use biological weapons against civilian populations but CiV isn't really built around that.
I am not saying that the Iroquois were insignificant or unimportant to the region, but I do think its giving them way to much credit to put them on the same level as China, England, or India while saying countries like the Netherlands with the Dutch East Indies aren't even worth mentioning. Especially when (at least in my games) the Iroquois swallow these civilizations like some weird version of the Mongol invasion.
To any who might say that the Iroquois were important because they controlled a lot of land I would have to say that the people on the land make it mighty. The land they occupied back then and still now has a pretty low population density and is/was highly dependant on foreign trade to meet every day needs. I should know I live in Brantford, and learned Iroquois history as part of Canadian history. I am proud to be Canadian (especially when its hockey time in the olympics) and we have always been impressive at certain things for having such a small population, but there's only so much that a country can do with a total population that could just fill an abandoned tokyo