So, the original release of Dynasty Warriors 9 had the Mandarin dub in the game, but it was removed almost immediately by Tecmo Koei because they had an agreement to use that specifically with a China-only variant by Tencent. However ...
I don't know if the dialogue is stilted because the VAs were trying to WordFit and did it poorly without real voice direction, or if they just can't read English off the page well, because it's really bad.
On the flip side, the Mandarin dub is freaking masterful, and they CVs don't even try to lip sync sometimes because of the huge discrepancy between the Japanese mouth movements and how concise Standard Chinese can be.