the story has some problems
Unfortunately I think this film suffered because of the 'happy ending'. There is a beginning and a middle but no end. We really needed to see the lead female character die. Of course that would make it less popular as a romantic movie. Possibly there could have been a scene showing her death 20 years in the future, which would have lessened the tragic impact a little.
Another way the story could have been written I think is to minimise the melodrama and heighten the humour. Dispense with the beginning, show the character's relationship as established from the outset, and make the film a comedy of errors. That way it can be a 'no-change' storyline where it ends pretty much as it begins- things will never run smoothly in their household, but their love is strong.
I know it is a very well-liked movie but I thought it had a major flaw by having a beggining and a middle, but no end.