My thoughts on common objections.
Don't get me wrong. I think disliking this movie is completely justifiable. If you're one of those people who gets turned off by teenage romances and likes historical fiction movies with a documentary feel to them like Gods and Generals, you better stay away from Titanic. (1997)
That being said, I don't think a teenage romance is always a bad thing...if it's well written. Rose is a flawed but sympathetic protagonist. Sometimes she can make scatterbrained decisions because she's young and human but I still found myself caring about her to the end. I especially liked the scene where she hesitates before going back to the floor where Jack is trapped with the axe when she sees the water is deeper. It illustrated how courage is being afraid but facing your fear, nonetheless. She knew she was partly to blame since her juvenile provoking of Cal with the drawing and note set Jack's imprisonment in motion, so she faced up to the consequences and risked her life for him instead of only thinking about her own safety.
As for common objections. Here's how I feel.
1. "That damn door!!!"
In real life, they could probably have both fit on the door. But judging from that scene, it kept flipping over because it couldn't hold both their weight. So Jack gave it up to Rose so she could dry off since that was the chivalrous thing to do. It's easy to speculate about what you'd do in a life threatening situation but you really don't know what you'd do until you found yourself faced with that situation.
2. "There are starving children in Africa and you toss a priceless gem in the ocean!!!"
Well technically, the naysayers have a point but who's to say Rose DIDN'T do philanthropic work? The casting of the necklace in the ocean was symbolic of how she has finally made peace with the past. Now that she has told her story, she doesn't have to be haunted by any of those memories anymore.
3. "Gee...I feel sorry for Rose's husband at the end."
We never see Rose breathe her last or hold an object in bed and let it fall. So we don't know if she died in her sleep at the end even if she was 101. She could have lived for another two or three years for all we know. She could have just been dreaming at the end of being reunited on the ship with all the others.
Rose didn't stay stuck after Titanic. She changed her name, started her life over and learned to love again and that is exactly what Jack would have wanted for her.
There's a really great fanfiction story out there called "Absolution" which serves as a sequel to Titanic. It tells how Rose fended for herself in New York City, how she makes sense of her relationships, flashbacks, how she recovers from the trauma, the new friends she makes and the man who became her husband. Every Titanic fan ought to check it out. I felt, I got to know more about Rose in this story than in the actual movie!
https://bbb101.tripod.com/absolution.htm