Running wiring for a dishwasher
I have done that, hole in the floor back near the wall,

MC Modular Whip  to a junction box in the crawlspace and then romex from the junction box to the panel. 

I did not hard wire the whip into the dishwasher, i installed a  surface mounted metal outlet box and connected the whip to that and then a regular appliance cord from the dishwasher to the outlet. 

The appliance cord will make the installation and removal of the dishwasher easier as the MC is stiff and will cause problems.