If it's NFL, it's worth watching to me, even if it is 2-12 Cleveland vs 3-11 Jacksonville or another unsavory match-up.
Come on, if I can spend hours watching guys in spandex who will "probably" end up in the NFL run and jump through hoops at the scouting combine, then I'll watch any regular season NFL game on general principle.
It's the National Football League, the highest level of the greatest game on Earth. If it's being broadcast, it's getting watched.
As Dave said there are typically (6) games per week that you can watch. So if you watch all the games that's 18 hours (6 games X 3 hrs per game), plus a minimum of two hours for pre-game, post-game, & time overruns; so lets say 20 hours per week on NFL.
There are 168 hours in the week, less 56 hrs for sleep (8 hrs per night), less 40 hrs for work (if you have a job), less a minimum of 35 hrs per week for eating, commuting, chores, etc (5 hrs per day), that leaves only 37 hours for relaxation and free time (at the most).
Personally, I don't want to spend over half of my free time watching just NFL football. Granted there may be a couple weeks of the year where I do that, but usually not.