It'll be interesting to see how the series translates to TV. If they follow the books there'll never be much of a core cast besides Reacher himself, so it would be almost an anthology-type show. You'd have a good opportunity to cast some big names in the supporting roles, but not have to keep them on for several series.
But then people like characters they can get invested in on TV so the writers might introduce other rolling characters, diverging from the books in that way.
I'm hoping for good things, I really like the books and I think Alan Ritchson looks like a good Reacher.