I personally like DW6, but my opinion is biased as I enjoyed DW4 and bought both the Samurai Warrior games.
It isn't just Sun shang Xiang and Yue Jin that share the same moveset. I believe Huang Gai and Wei Yan, Zhang He and someone else are linked amongst several others. And the renbu system is kinda whacked for me in that it degenerates over time, a problem solved by getting a horse with renbu gait.
On the topic of horses, you know get them randomly dropped by officers and crates. Including the legendary horses. This makes it mind boggling difficult to get them unless you have luck and the Lady Luck character trait on your side. And even then you have to build the horses up with a character that possesses the Horsemanship trait (Guan Yu or Xiahou Dun). I've had the game since its release and only recently have I managed to get a legendary horse. There are still 5 others.
Weapons are also similar. IIRC, no more 4th weapons and there are three types of weapons available: Normal, which increases your reach as renbu goes up, power, which increases its damage as per above and speed, which does the same only makes your attacks faster. Kinda it, just go for random grabs on harder stages with higher difficulties to get particularly good weapons.
If DW is your thing, go for it. It's pretty, the gameplay is more or less the same and it works for stress relief. If you can wait, I say watch
Kingdom Under Fire 2. It actually gives you units to command, has your personal unit follow it and allow limited orders such as tightening or loosening rank for different effects, degenerates into a chaotic melee when you engage another unit, use of magic, equipment purchases for your unit, branching unit progression tree and, as of the new one, an online MMOesque portion. I'm going to assume you can design your officer for that bit.
I've committed the greatest sin, worse than anything done here today. I sold half my soul to the devil. -Ivan Isaac, the Half Souled Knight
Mecha Maniac