The following impressions come from Nintendo World Report:
Mario & Sonic at the Rio 2016 Olympic Games on Wii U is fun, even if the amount of events is rather limited. With about 17 events, it doesn't feel grand for a console entry and that is a shame. The bigger insult is the lack of the Dream Events, which I consider important for what these games are trying to achieve. The way they present the games though, is the best it has ever been. It is a major trade off, but I do get the feeling that this could turn into a decent local multiplayer venture for all ages.