ABC is introducing a new special investigator to its Tuesday night lineup. "RJ Decker" stars Scott Speedman in the title role, Jaina Lee Ortiz as Emilia "Emi" Ochoa, Bevin Bru as Detective Melody "Mel ...

But ABC's Tuesday nights have a top-to-bottom lineup of shows that are scoring with critics and fans – and pulling in some big numbers along the way. With that in mind, we have some thoughts on why ...