One issue many, like me, had with NTW and ETW was the time between turns. ARGGGG it takes to long. Shogun 2 demo was quick like 3 seconds per turn, but the full game is more like 15-25 seconds per turn. An imporvement over the prior too but still too long for my taste. The only saving grace in my opinon is the music and the gorgeous map, more the music it really is great! I did get to see a preview view in actions a month ago, it did not have all those factions from what I recall.
I've only started playing the campaign, spent most of the day playing around with settings and just watching units march around in custom battles. From someone who has played far in to the campaign do the speed of in between turns slow down, speed up, or stay about the same?