It killed me. The last third of the film was genuinely terrifying to watch.
I have a hypothesis that Cameron invented the love story as a way of taking our protagonists on a journey through the ship, so that we could see it in all of the details and witness the catastrophe unfold from as many angles as possible.
Unexpectedly, it presents a good social critique, highlighting the way that the effects of catastrophes are mediated by social structure, i.e. the rich suffer the least and the poor the most.
A great film overall