I officiated intramural flag football in college. We played 7v7, no rush counts so teams played with linemen, but everybody was eligible. Some of the teams were a lot of un to watch, including the IU Baseball team, that would usually win the top division (former coach/current Michigan baseball coach Tracy Smith would play QB, which was funny since he was so much older than everyone else). Also played a couple of seasons of rec in my early 20s.
It's fine for scaled down football, but not a sport I'd want to watch on TV. Rugby Sevens is a better game, IMO.