Steve F at 2016-03-01 20:42:28:
I thought the plot was compelling. Besides the power of the subject matter itself, the procedural construction to me was easy to get absorbed in. Granted a movie with interviews and Excel spreadsheets is going to be up my alley, but I like to think that the appeal of the case being built was strong for many viewers.
And as you mention, they did an excellent job incorporating the stories of victims and personal subplots of the Spotlight journalists to add weight and depth to the case.
Considering also the inclusion of the legal system and civic institutions like the Church and the Globe, this film could have gotten sprawling and out of control. But it was so well-focused to sustain interest, while still providing a clear sense of how vast the impact of the scandal was. No small feat.