Played as the Qin state and won before 221 BC. In history, the Qin states' advantages lay on it geographical location and military prowess. As such, one ideal play style is be aggressive from the start.
I started by seizing fertile areas closest to enemy capitals, quickly ending Wei and Han, before progressing on the remaining states. Since game rules state that losing the capitals marks the end of a dynasty, occasionally this along brings some luck in AI mechanics, with enemy states focusing on the newly-neutral ground instead of your state.
Only downside, yet an understandable one is the lack of diplomacy, since bribes or negotiations during the warring states period were often used to maintain temporary truces.
hmm there is a glitch on one of the weapons - the SigSauer P226. The last bullet will not find its mark even when fired. To compensate for this i often have to 'double tap'.
 "Two Powers 2")
 "Sierra 7")
 "I Am An Insane Rogue AI")
 "Enigmata 2: Genu's Revenge")