The most polished Total War game, whose campaign is actually challenging with aggressive AI and whose multiplayer community is actually active after so many years, is the laziest?
And for unit variety, compare it with the other total war, but from 1 culture.
See the Greeks in Rome 2. Hoplites. Hoplites with bigger shields. Hoplites with armour. Hoplites with better armour. Romans: Legionnaires, Legionnaires with bigger shields, Legionnaires with better armour and helmets, Legionnaires with spears, Legionnaires with more men, Legionnaires , Legionnaires and more Legionnaires.
Empire: Grey soldiers against Blue soldiers against Red against Green.
Napoleon: Blue Soldiers against Grey soldiers against Red soldiers but with different hats.
Oh, and if you compare Shogun 1 units with the new one, you 'll see there are way more units now.
Although I can agree with you that the Sengoku Jidai's Units' models look more like a mod than an official DLC, since they are almost the same with in game units (Wako raiders being naked samurai, Long yari being ashigaru with a bit longer spears, etc)
As far as the 2 campaign expansions are concerned, I cannot have any complaint, because I found the both very interesting, gameplay-wise.
And finally about creativity. Well, I find Shogun 2 by far the most aestheticly pleasing Total War out there. With vivid colours, high contrast. One battle at the bright green fields, followed by the next one at the white snowy fields turning red from the blood, and then followed by a naval battle at the deep blue sea of Japan. Compare this wth the fifty shades of
, I mean brown, from Rome 2 and Attila. Even fantasy title warhammer is darker and more dull, thus less appealing.