As with every other attempt at a new league, the challenge will be for people to care about a team. Sorta the same problem hockey deals with. If you watch enough to know the players and teams, the product is entertaining enough.
So far the play itself looks like early season college where teams are trying to figure themselves out. Generally, high level QBs and o-linemen find homes in the league, but there are plenty of slightly undersized athletic defensive players. Makes it hard for offenses to find a rhythm. Kickoffs are definitely different, I kinda like them, way more interesting than trading touchbacks. Also fun to hear the coaches making playcalls during timeouts and player interviews as they come off the field.
Overall it feels like football and not a gimmick. We'll see how long it lasts.