Been playing on Monarch.
Tried Iroquoi, Arab, and China on the setting.
Iroquoi game stuck me in a continent with few rivers, no maritime city states, Ottomans to the left, and lots of Forests.
I found out to my dismay that the Iroquoi UA only kicks in when you're in friendly territory, so no scouting with it, and you can't establish Trade Routes with it early on because your culture doesn't span the distance between cities.
Without Rivers, without Maritimes, it took forever for my cities to grow. I resorted to farming bare grasslands and making up the difference with Granaries. Fortunately, the Longhouse proved very powerful. 1/2/2 and 1/3 tiles are very strong, especially in multiples. It blunted the lack of food by a great deal. Was still able to get Oracle and SH. With the resulting culture, was eventually able to cut roads, save on money, and be very mobile within my own territory.
With the Longhouses, the Iroquoi Warriors proved very easy to spam. It was so easy, I thought I was in Civ IV again and made like, 10, and found my bank going bye, bye. Targeted the Ottomans as a solution. Warriors in those numbers easily overran the AI, with neither Siege nor Archer support.
Lots of troops and fantastic production carries on into the latter ages.
Tried Arab. Won Science, but had choice of victory conditions available. I think I could've even swung cultural, and domination and diplo were definitely on the table. Camel Archers are brutally, brutally good. I crushed the English Longbowmen with those babies. 3 Movement, 15 range attack (better than the era-equivalent Crossbowman), 10 defense, and able to move before and/or after the attack!. This essentially means that Camel Archers are the ranged equivalent of Companion Cavalry. They can dart in, drop their ranged attack, and dart back without coming under City Bombardment.
If they're charged by melee, they have decent defense. If they survive, they can fire back, and still move 2 away behind your own melee. Generally, though, with 3 move, and 2 move every turn in any case, you shouldn't be getting caught by melee.
Haven't used Longbowmen yet, but if they're like every other unit, they have a 2 tile sight range, which means that they can't use their Range special unless they have a sighter unit. This is how Camel Archer dominate them. They can always sight without giving up their virtual 3-range, and they can always easily fall back to a better location, or reposition to FF a Longbowman that's out of position. Needless to say, between the higher power, higher defense, and movement advantages, normal Ranged units don't even stand a chance.
Bazaar was outstanding for a non-warring strategy. Lots of luxuries to prop up weaker Civs, lots of trade bait for getting luxuries.
China's as awesome as usual.