The Shaolin Monk is a very strange unit. Its description says it is for defense and healing but it can only get the first City Defense promotion and can get a number of attack related promotions (long red line in pics). It can also get a number of promotions not associated with defense or healing eg hunting and crime fighting (green lines). Short red lines are others I think strange for this unit as it is already defense only.
Also the wonders that build a route
- Via Appia - paved roads
- Route 66 - highways
- Golden Spike - railways
are not very wonderful and are definitely not great wonders because by the time you can build them you workers have already done what the wonder does.
To make them Great again they should do what the Via Appia mod first did, it built the paved roads in every plot with in your cultural borders.
To make them a national wonder remove the building requirements and reduce the cost.