Betting the under, whether it's a full game, half, props or any other derivative always feels a little deflating to me, even if a win is never in doubt.
There's just something about rooting for things to not happen that takes away some of the joy of sports in general and NFL football in particular -- at least for me.
No one tunes in to watch offensive ineptitude and punt after punt.
Thursday Night Football is generally the worst for this, as the short week necessitates little practice, compressed travel schedules and simpler game plans.
Using that logic, it would seem that Monday Night Football should be made for OVERs since there's additional time to prepare and maybe add a wrinkle or two.