Pick it up. Explanation to follow:
First up, the province system is fantastic. Take EUIV's States, but instead of ~3/state each province contains something on the order of a dozen territories. This means you can have small cities with massive populations with fairly low-pop hinterlands. This also feeds into the map, which ends up looking lovely with its scattered urban centers across a map that evokes all my Rome: Total War nostalgia (and music equal to the challenge).
Next, in place of EUIV's fairly static development values you have pops. This also helps with the cities part above, as a rural settlement might have on the order of 12-24 pops, while Rome or Alexandria will probably have a couple hundred by the end of the game. Each pop has a social stratum they belong to (slave/freeman/citizen/noble), a culture, a faith, and a value for their happiness. This means your capitol will end up continuously converting the piles of pops taken from your conquests, and that conversion isn't a switch flipped by your limited Wololo count but the result of converting pops one by one.
As myrt notes, the trade is a bit weak, but while as a whole it could have used the second pass other systems got before development ceased, it does support something fantastic: food. Each province has a limited food store, and it runs out your pops will start to stave. This means that a massive capitol will require significant development of its hinterland as well as imports to maintain, which is fantastic. Additionally, your armies require food, taking quite little attrition by PDX standards until it runs out. This means you need to ensure that the armies on sieges actually are ready to maintain the siege, and you can absolutely exhaust a province's food stores while campaigning there, causing starvation for territories and the army.
I'll throw in my 2 cents for Pandya (nation in southern India) with the Invictus mod. You have a lot of local powers to fight and feed on, just enough strength to take them on if you play smart, and a final boss in the form of Maurya. Plus, Invictus adds a host of decisions to improve resource exploitation and some fun missions to turn your home region into a thriving area.