Rome: Total War playthrough:
First time, I played as the Persians... I liked the guys =). Although they have few units...
Then I played as Germany, Spain (forgot the name)... I also played as Armenia, Pontus... I wanted to play as Denmark, but didn't have time =)

I didn't play much as Rome... because they are overpowered, and I don't like it when it's too easy... =)

In Barbarian Invasion, I played as the Franks (completed), then I played as... hmm... they have a banner with three red triangles on a blue background... or maybe the Burgundians... I don't remember)

In Medieval II, I played as France... now I'm playing as the Moors... then I plan to play as Germany (Holy Roman Empire) haha, and as Byzantium =)

I played the first part of Medieval as Denmark, but I didn't finish it... I got bored... and it's not fun to play it after Rome) because the graphics and everything else are completely different =)

P.S. It's a great game! The best military strategy! IMHO