NBC's coverage is okay from my perspective. For the most part, they do pretty good at covering the sport themselves, though they aren't always great about really laying out what's coming up. I knew what was going on with swimming stuff last night, because I kept track of the schedule online, but they would kinda just say stuff is coming up without really saying when.
The fluff pieces do get a little over done after a while. From what I was reading the other day, apparently the reason we get so much of that stuff is NBC's research shows women are more interested in the Olympics than men, and their research shows women are more interested in the story surrounding stuff, than the events themselves. Not sure how true that is, but that's why.
My biggest annoyance with NBC's coverage, is I think they spend too much time on fluff pieces about the host country, and completely gloss over problems. I haven't seen one piece talking about the numerous issues leading up to, and still going on, with the venues and Olympic Village and such; but I've seen a least 2 or 3 fluff pieces on how great Brazil is.
If anyone has trouble following what's going on, or wants a good schedule or anything, just search rio 2016 on Google, and there's an excellent thing that comes up with schedules of all the events, links to different sports and athletes, etc... I use that to keep track of what's going on, and so I won't miss anything live that I care to watch.