A few notes from my Carthage game (before it crashed in around 960 the second time). Monarch, since I wasn't good enough to play Emperor even before the patch:
Saharan barbs don't go near Carthage. I had four barbs total, all HA's. The rest sat around an invisible line in the sand... You can tell where the dividing line (between northern and southern Africa) is as well. I built the Great Wall (didn't need to, as it turned out), and the wall disappeared (just stopped) in the middle of the desert; one spot S of Sala (Iron in Mauretania)!

The barbs could have gone around the Wall, instead of watching a few squares back! I wish I had the screenshot.
When the Malians spawn, they will either have a huge number of free HA/CA/Elephants, or they will be disposed of quickly.
Arabian barbs are nasty, and there are too many. They razed Jerusalem, Ur, and Babylon (with walls) my first game, and then razed Jerusalem (with walls), Sur (with walls), and Babylon the second. I had just got my dye objective the second game, thankfully. Unfortunately, it left a very empty Middle East, and Saladin only built two cities: Mecca and Ad-Dammun. He conquered Gordion, but it was weird watching workers build a road from Mecca to Gordion with only ruins in between anywhere. San'aa, which could sometimes survive until the Arabs showed up, becomes ruins very early on.
Judaism was staring to take over the world when Jerusalem was razed the second game. 26% and counting. I actually used my GP to help bulb Theology (still needed five turns of science) so I could found Christianity.
The Babylonians won't attack independents or barbs. Sur was taken by them the first game through flipping, and I took it the second time.
Both Hattusas and Gordion were barbarically alive and well when I showed up in the Eastern Mediterranean in both games (which happened maybe twice before for me in a hundred games), and producing warriors. The HA's that kept spawning in Anatolia and the Caucasus probably didn't help...
On the other hand, the Arabian barbs did destroy Sena (Egyptian Sinai peninsula city), as well as the copper city (forgot the name). The Egyptians never built towards the Middle East previously, even when Jerusalem was razed, and the Arabian barbs didn't like going to Egypt, so I like the continental division there.
At one time in about 300AD (just after my GA), Rome, Egypt, Greece, and Carthage were all unstable or worse; Babylonia was gone. Over time, Egypt and Greece fell, but both managed to stabilize for a bit (another unusual occurence).
Rome turtles. They built Pompeii and a city in the Balkans (I forgot the name) then much later built Mediolanum and took Lugdunum (in the AD's). The Celts were generally left alone. Later on, after Cadiz had been razed, they did found Pax Iulia (SW corner of Iberia), which was cool.
Greece was about to build in southern Italy, but the Romans in Pompeii got to it first.
More barb tales: The Celts had a thriving civilization in France (and Inverness, as it turned out). As my trireme explored the French coast, Spanish barbs came from the south (two stacks of seven towards Burdigala!), Germanic from the north. France and Spain received many barb units when they spawned.
The barbarian triremes that randomly appear near the Canary Islands and make their way into the Mediterranean are a nice touch.
The Vikings only built Nidaros and Oslo up until 960. Where their ships went, I don't know. I didn't ever see them, and I explored the whole North Atlantic/Arctic.
Spain founded Madrid, then left only a settler there (I could see this through Lixus's culture) while their other settler went off to found Barcelona (alone). The next turn, all the units went back to Madrid, and the settler went to found Cadiz, alone.
When the Spanish declared war on me, one swordsman in Italy went to my wine in Sicily. It then left, and didn't pillage. Cadiz stayed unit-free, and I finally captured it about five turns into the war, by unloading an archer.
When Carthage captures Cadiz, shouldn't it become Gades? Or is this the result of the names changing over time?
The Indians were solid/very solid from 500AD until my game crashed. That was new.
Bug?: I met the Persians early in the game, traded with them, and had an OB. I lost contact, and a few turns later, I met them again. It was like we had never met. Cyrus refused another OB. It was only the second time we had talked, and the OB had never been canceled.
I met the Khmer when my trireme passed by the west coast of SE Asia. Suryavarman had sent his Buddhist missionary exploring through the jungle, on its own. The Khmer didn't become Buddhist until 820, six turns after spawning.
No-one seems to be able to trade with each other. I quickly outpaced the ancient civs through trading what I knew, and had almost caught up to the Europeans by the time they spawned. Even the Romans weren't close to me - the Persians, Egyptians, Greeks, Babylonians, Indians, Chinese, Ethiopians, Japanese, and even the Arabians and Vikings were all way behind by 900. I traded when I could, and the others didn't trade, either because of the tech brokering, the many barbs that made it hard to trade, or both.