Well, during the last CBA it was negotiated that there could be no two-a-days during the summer, and you weren't allowed to tackle. This made the first 2-3 weeks of football a sloppy mess each year since starters had only been tackling for about 45 minutes combined the entire summer (the 4 preseason games). There's also the Thursday night game where teams don't have time to prepare so that game sucks. So guaranteed, there's 3-4 weeks of bad football for your team.
This was done in the name of "player safety" and "extending careers." Has it actually done either? I'm not sure.
The new CBA, from my understanding, is cutting out two preseason games. So now starters have about 15 minutes of full-contact drills this summer. My guess is this will lead to a minimum of four weeks of shitty football, possibly 5. To top it off, in addition to 7-9 teams making the playoffs, we'll now likely get more sub-.500 teams making the playoffs each year... though if it ends up being "the 10-6 team that somehow wasn't eligible in years past makes it in" then I guess it's possible it could be a better format.
I guess we'll see. Like I've said in other threads though, my consumption of football has gone from 12 hours per week to about an hour and a half... the product is SO bad these days. I've barely even watched the playoffs and skipped two Super Bowls in the past three years.