I never saw this show until last week's The Fifth Step. I was hesitant, as I didn't want to watch another "person speaks with dead people/ghosts who help solve crime by dishing out otherwise unknown info to said person" show. The thing that immediately caught my attention was that, since the "victims" are all in Raines' head, they don't know anything more than he does. They just provide a different angle to the crime. Which, if you pay attention to what they say, was actually there all along, just not that obvious.
All that said, I'm definitely going to give this show a chance. Having Jeff Goldblum doesn't hurt either, and I think he fits this role very well.