FOX football in 720p has, IMHO, sucked for years. When I watch a CBS 1080i broadcast on my top-of-the-line set, the CBS broadcast hands down looks far superior.
And some of us who also have great TVs don't see what you see. I see a wide range of PQ on bith 720p and 1080i games. Some of the Fox games on ST are stunningly good. Some espn is awesome. Some is bad. The production and, in the case of networks, local handling cause far more variety than the silly 1080i/720p nonsense.