I don't really like the Empire Total War era. But maybe I will install it, to see the new gameplay, graphics, naval battles, etc.
I agree that the RTW AI was better than the M2TW. I think the only faction that is destroyed by the AI is Lithuania. I'm not sure though.
M2TW gave us super beautiful graphics and the SS, the most well-worked and biggest mod.
But it is it's size that make it so boring, each time u press the "turn" button. But many people worked on it, still working and are fascinated by the arts of war during medieval period.
Way too much, I like the RTW era, the
Persian, Greek and Roman arts of war, because it thrills me that before 2500 years those people achieved so much in comparison with us, which the only think that matters is to speak more on the mobile and to pay less...
As for the main question, I think ETW would be too much boring, with huge Empires to rule vast regions, packs of people to shoot each other and grand cannons to demolish enemy fortification like paper and naval battles like to see the "Mr Jack Sparrow in new adventures"...

...
The question about CA, is why CA is making so shallow the vanilla games, with no historical accuracy, not too much settlements, no depth in faction unit roasters etc...
Do they say... "We have the Modding geniuses to do the rest?"
I cannot understand...