Aggro (in my experience) is worth playing, if you keep its limitations and focuses in mind. Although the new successor (pun intended) Imperiums is a more polished version of the same engine (and no longer distributed by Matrix/litherine, iirc?)
Its map is kind of small for such games, but you do get the option for self-designed maps (not a lot of workshop maps unfortunately), and randomly generated ones.
The UI is a little rough and fiddly. The unit scaling doesn't make much sense. (Mines are essentially undevelopable cities with easily 5000 people; but don't worry, because your scout groups also have thousands of people!)
It has some depth of development, arguably more than FoGEmp though nowhere near as much as Imperia or whatever the recent Paradox Rome game was called (released at about the same time). Unlike either of those two games, hex-terrain modification is a key gameplay component. All three games have an important supply mechanic, too, but Aggro's supply is easier to understand and manipulate. (But also a lot more unforgiving if you stress it.)
