I know some people don't like unique National Wonders as UBs, but here's the deal - it is far easier to balance a singular unique building than creating a useful unique building for all cities. In the case of Rome, the new UB is essentially a UA-enhancement, pushing you towards your goal and making your empire even stronger.
To those of you saying that Rome should be 'expansionist' and not 'militaristic,' keep in mind that, in ancient roman history, imperial expansion and the roman military went hand-in-hand and were, ultimately, the same thing. I don't like to play the historian card, but this is what I do for a living (imperial history), so I like to think I know what I'm talking about.
Regarding Morocco, the Kasbah will form a ring of UI around their cities, giving those six hexes big bonuses and making them highly defensible, thus making Moroccan cities extremely hard to capture. This is reflective, in my mind, of the difficulties of France during the Algerian Crisis in the 1960s (yes, Algeria is not Morocco, but 'kasbahs' were a large element in the history of Algiers). In short, Kasbahs made it nigh impossible for France to subdue and maintain peace in Algeria during the revolution due to the defensive capacities of the kasbahs in and around Algerian cities. Since Morocco has kasbahs, so they get this bonus.
G