But Han was much less so "sacrificing for the greater good" than Luke. Han went to rescue his son, at the behest of Leia. He might've had a hunch it might not end well, but I don't think he though "well, if I get slaughtered, it will provide some motivation for this strange Force girl." I also think Han's mentorship had its limits- the Force Awakens Han is also one who murders people he owes money to. I'm not sure how much more he could have taught Rey.
Whereas Luke freely accepted his death as a means to save the Resistance, inspire the moppets, and pull off the galaxy's greatest Force trick since the Miracle at Farpoint by the Trandoshan Biff the Younger.
I guess they could've spent more time acknowledging Han's death at the end of Force Awakens, but I think the characters have the pretty good excuse of being hunted guerrilla fighters in the middle of a war. The Vader pyre, Jinn funeral, and Amidala funeral are all carried out by characters who have the benefit of not being under siege.
The Resistance initially aren’t gueurilla fighters. They are a government black ops and mercenary team. (The confused set up never goes away. Bit of a fumble but easily glossed.)
Han goes down to that bridge for no one but Ben. Not because Leia told him. He knows he has a good chance of not coming back. But that is inside the story.
Outside the story, his death is there to fulfil the things I describe before. Han is the Obi Wan of episode VII. Hence his ‘it’s all true’ speech. Even his killing of the gangster smugglers is like Obi’s moment Mos Eisley. One last flash of the old ...extended in Hans case through the Cantina battle, some fancy flying, and planting bombs in a base. It’s like a condensed greatest hits.
I think the pacing is off largely through the choices made in the second film, rather than the first. It’s not the affront some people make out, elsewhere, but it does land some of the audience in having to hope JJ does better.
I think the next trilogy is gonna be an interesting thing...with no OT components to pull on (they will run out of characters to break and kill) I wonder how it will fare.