I think the (a?) problem is that...dirty little secret...football is generally very fucking boring to watch. So much down time.
The primary exception is when the players and schemes are outrageously great (which is not present in the XFL). The secondary exception is when the pageantry and atmosphere and emotion are outrageously rich (which is also not present in the XFL).
The XFL is like if someone thought, "college football, but sterile."