The only downside is drafted units do not get any bonuses.
Do drafted units have penalties? They used to have in civ 3 if i remember correctly.
I've never seen the purpose of drafting (or nationhood for that matter) -- for the same reason that I don't see much use in slavery by the time my techs are that advanced, except to quickly build up infrastructure/bring down happy faces in newly conquered cities -- except for the rare case that I'm desperate to raise troops quickly because I'm surprised in a war. And if you're not already running nationhood (which I would never be since I don't see point otherwise) or don't have ability to switch to nationhood without delay (i.e. you're spiritual or in a GA), then it doesn't give you the immediate fix you need then either. And as far as doing it in a Globe city, I guess I'd not want to choose a civic thta just benefits one city & not my whole empire. So to me nationhood is one of those civics I just don't see the point of, outside of very unusual, temporary situations I describe above. What am I missing?
I have, but only to get a few units quick for tactical reasons; I've never conscripted incessently under it to build a big army quick. Braindrain's comment about Mehmet is an intriguing one, I'll have to file that one away ...You should try drafting sometime, even if only to experiment with it.
some civilizations are better suited for nationalism and drafting than others. the best example would be mehmet and the ottomans. his expansive and organized traits are tailor made for many large population cities, and with the jans as his musket uu, he just screams for drafting and whipping a massive army to go conquer a continetnt with. especially if you play epic/mariton games, it is really worth the nationalism and gunpowder rush (liberalism helps)...you can turn out a ton of jans in just a few turns while other civs are stuck with longbows.
if you have a draftable uu and lots of population, you'd be crazy not to to use nationalism!
don't forget england. The ability to draft redcoats is a powerful ability!!