Cano-Basave and He (2016) ranked speakers in political debates by using semantic frames which indicate persuasive argumentation features, and Habernal and Gurevych (2016b) compared the convincingness of argument pairs using feature-rich SVMs and bidirectional LSTMs.
the persuasiveness score of an argument is only of limited use for argumentative writing support, since it summarizes various quality criteria and does not explain why an argument is weak.