Mine is horrible as well. With my Note 5, in some low signal area's at work, it would drop down to one or two bars and still work, but at 2G speeds. With my Note 7, in those same areas at work, i completely lose connection. Once i get out of those dead spots, it takes 15 or 20 seconds to reconnect again.
It still shows that i have 3 or 4 bars on my display, but my Signal Check Pro app shows the connection is completely lost. If I'm using any app in a low signal area, it will show 2 or 3 bars, but the app shows i lost connection completely and advises me to reconnect. I have T-mobile.