It is nice of them to add something new, but I am a bit disappointed by the NSO emulated game library. There are still many big name first party titles missing and I would not mind paying a bit more for a much more robust library.
The service looks shit and seems to be their way of arguing against emulation "we are working on making these games available so there is no legitimate call for roms" is my view.
I hate that Mario is tied to Nintendo, Nintendo are a shit company.