1) Capricious and erratic enforcement of rules by officials makes many of these "primetime games" unwatchable
2) The "average Joe" is turned off by players making $20 million per season who sit out because they have a sore ankle or tummy ache
3) The protests turned some people off
4) The announcers typically suck balls...everything is over-analyzed in a politically correct way and done so as not to offend the Patriots
5) Far too many commercials
6) Commercialization of the product (beer, cleats, towels, underwear, gloves, golf carts, headphones, etc).
7) Parity
But yeah, I still watch it when nothing else is on.