I get what CO says about couples who like each other and try so hard not to show it that it comes off oppositely. But those couples are usually in junior high school. I've seen plenty of movies where adults are acting out the same way, but don't behave like teenagers.
In fact, I think a whole lot of the dialogue in Empire was aimed at kids particularly, instead of the "whole family" approach that Star Wars took.
To each his own. I will certainly grant that The Empire Strikes Back delved deeper into the personalities of the lead characters. But with the exception of Han Solo, I didn't like what I saw in the depths.