Sorry but OurLoader should not be used anymore.
Do you mean it's brick-risky now or it won't work anymore due to a console update or something? Or were you referring just to Super Mario 3D World which is mentioned anyway in the first post as known to not work?
I wanted to take the risk and import Just Dance Wii U (Japan-only exclusive) and test it with OurLoader on a EU PAL console but now I'm not sure after your post. I'd like to try OurLoader before anything else like regionhax.