I hate my phone and ignore 99% of mobile apps that come out on it (Miitomo is the only one I've spent more than about 5 minutes in, including Fallout Shelter) but I might try out Go; if nothing else, it sounds like an excuse for me to get outside more than I ordinarily do.
The game's been in development for god knows how long, at least, which implies that Nintendo put more effort into this than your usual standard fare app store rubbish.