I saw it when it first came out in the theatres back in 1997 and thought it was good ... better than I'd expected.
I've watched bits and pieces of it on TV over the years.
According to the Toronto Star ...
[Cameron] spent a reported $18 million and 60 weeks revamping Titanic, and the evidence is in every second of the film’s 3½-hour running time. The images are sharper and the screen is more brightly lit, eliminating the common 3D annoyance of feeling as if you are watching while wearing sunglasses.
Will you go see it in 3D? I might.