For me it depends on the quality of play in a low-scoring game. Sometimes each team's OL and DL are evenly matched, so the battles go back and forth, and there's great DB defense on well-thrown passes - those are fun to watch. But a 9-3 game with lots of dropped passes and open-but-overthrown receivers, scads of penalties and crummy line play by both teams - that's time to switch channels.
The Saturday games, especially SF/GB, were on the sloppy side. The Sunday games had their share of muck but each of those were incredible near game's end, though some pass coverage was incredibly bad. Rams getting to FG range in 42 seconds was wild but KC doing it in 13 seconds was unbelievable. (And I missed that last one, changing channels after the Bills scored as I thought "game over".)