Starting to go up difficulty levels and in my opinion it's way more punishing than Civ5 (where I usually played Emperor or Immortal). For example, on Emperor the AI gets a second settler at the start (not to mention a builder and another base unit) -- in Civ5 they only get the extra settler on Deity. The yield bonuses are pretty huge if I'm reading the XML files right and they double every difficulty jump (first level at King). I started one game on Emperor and at turn 50 I had 12 fucking War Carts from Sumeria. Even though I had basically the second best starter unit (Eagle Warrior), I only had five of them (which seemed like a lot for turn 50 on Epic). I got fucked so hard. This was literally the first time I've ever lost a Civ game because my cities were eliminated.
In another Pangaea game, Standard size map, with Gorgo, I had an amazing start -- good land, civs far enough away, and city states near but not too close. So, I had a nice start. Anyway, get a ways in and Sumeria declares on me but I'm set up pretty well with Archers and Hoplites. By the time the war ended, I had killed, no joke, 42 War Carts. I had tried to get him to make peace for every round but nothing would do. Yet, when he finally did, he game me over 100 GPT. Makes sense!
I don't know, I think larger maps with big land masses are just punishing at this point. The yield bonuses are so high the AI can just keep pumping them out almost every turn. I'm probably going to lose by religion because Ghandi is shitting out missionaries and apostles. At one time I counted and from only what was visible on my screen, he had 24 missionaries/apostles. How can you compete with that?
I would really love to see someone play a Deity game on Pangaea with at least 8 civs.
All that said, I think the game is fun. I might drop down a difficulty level, but I don't regret my time playing. There's shit that will annoy you and some stuff needs to be fixed but it's outweighed by the fun and challenge, imo.