It took me a while to get into this and I do think the title misleads you which creates an anticipation that is never fulfilled. You will not see the Titanic leave Southampton (well, in like the last second and it's not even Southampton), and while there are aspects surrounding its build that are addressed and shown, this isn't so much a mini series about the construction of the Titanic. It's much more about the current climate in Belfast at the time, the condition of workers and the always escalating tension between catholics and protestants.

The casting is mostly great, though do not be misled by the cover either: Neve Campbell nor Chris Noth are in this much. Maybe a few minutes in three/four episodes. The main actors, you can see listed below in trakt.tv. These are the ones you see on screen. The Silvestri sisters bring much joy and delight on screen, Kevin Zegers feels a little weak amongst the likes of Derek Jacobi and others but he's solid enough to keep watching.

Overall, a fair period drama that will not change your life or will mark you forever but an interesting one to better grasp the context of the time period.