Syagrius wrote:How about the Ottomans, anyboday played with them so far?
You either play them "exclusively" in the Palestine scenario, or you can receive their control in the Grand Campaign (stick to the two players GC for single player!). They have different kind of units as well, most notably obviously the turkish and arab units.
I think unit variety is excellent in the game, as historical detail in general. If you have the game and launch the 1916 scenario as Central Powers, you can immediately see that for example, German units built later into the war have their portrait with the newer German helmet, while older units are still showing their pointy helmet.

I like small details like that, and the game certainly provides them.
BTW, a tip for Ottomans in the Grand Campaign: when I get them to join me as Central Powers, I make Afghanistan and Persia my top diplomatic priorities, after the Balkan countries and Italy: If Afghanistan is peaceful toward Britain, and so is Persia, the Brits may be sneaky enough to send their Indian army through them. Persia especially is nice, because it provides a small army. Just a handful of not too strong units, but in that theater, they are quite important. Anti-British Afghanistan also not only denies the movement path for the Brits, but also ties down some British units.