Dicking around with native americans in the CoP DLC. They're rather overpowered. I was playing as Caddo which is a OPM tribe and I just bounced around the map for a few years before colonising around 5 provinces and roflstomping the Aztecs. Expansion is then super fast with +1 colonist from natives tech and +2 from exploration if you take it as the first national idea.
I was deliberately trying to play a very slow game since I was trying to see what happens if you get a nation with colonial underlings into a personal union and integrating them as someone who has their capital in the new world. No such luck apart from the PU with England (who had no colonial nations)
Thoughts on the DLC:
The patch has really limited AE and vassal feeding. While I thought AE and coalitions needed to be toned down a little it's pretty much nonexistent now. You cna go on a murderous rampage in the HRE and nobody will bat an eye. I personally find this rather boring since there's really nothing stopping snowballing now.
Not a fan of the change to vassal feeding either. Now vassals will almost never buy a province even if it's their culture and religion. My fondest memory of EU4 so far was punching India into little vassal states as Poland separating them by culture and slowly consuming them. I don't really see why it was removed, the AI was already restricted to buying their own culture and most places in the world are decently cultural heterogeneous. With the oversea integration malus it was fairly close time wise to conquering and coring. I would have just made vassal states more prone to revolt, harder to integrate or maybe an admin cost on top of the legitimacy cost.
As for protectorates I'm rather disappointed with them as well. What should be a really interesting mechanic seems to be nothing else but a fancy guarantee. Getting +50% trade is nice and the guarantee +25% tech increase for the protectorate is nice but it still feels lacking especially when compared to good ol' vassalising.
It would have been nice if they acted more like a colonial nation where you could impact their development by paying leader points. The ability to slowly Christianise, advance their tech standing and finally for a large commitment be able to diplo-annex them. I guess we'll see something like this in the likely Indian expansion.
It also makes the Eastern tech group much better than the Western tech group for the ability to vassalise Chinese and Indian tech groups. If you want to be the master of India then playing Poland or Russia seems to be the way to do it.
The random world generator is a mess. It's just simply awful. The best features out of the DLC have been the native play which is fun although possibly a bit too powerful and the colonial nations which really do add some interesting dynamics. Sadly the AI is still rather bad at colonising AI and I've noticed the AI is really bad at choosing areas where a colonial nation could form.
Westernisation is much better than before. It's less punishing and random than before but it does seem to weigh much more heavily on having a good leader.
All in all it's been a rather odd expansion. A lot of stuff I'm not too happy with plus some stuff I do like. I don't really see myself playing much for now, even playing up to 1718 as Caddo was a boring chore. I guess I just found vassal feeding more interesting than the war core war cycle.