From NetFlix:

Playing a sympathetic serial killer may sound like a stretch,
but former ‘Six Feet Under’ star Michael C. Hall pulls it off
neatly in this Showtime drama about a likable forensics expert
who channels his violent tendencies by killing miscreants
who’ve avoided punishment. So harmless is Dexter Morgan’s
(Hall) demeanor that neither his girlfriend (Julie Benz) nor
his sister (Jennifer Carpenter) has any inkling of his
extracurricular activities.

At first I thought “this is stupid and creepy and sensationalistic”. But it isn’t really violent (but really creepy). There are involving subplots and the plot twists are clever (if a tad unbelievable). You have to wade through the entire season to see the bad guy get his deserved due. I suspect that only someone like Michael Hall could actually make this idea work.

I Dare You!