TLJ suffers for lack of a new cohesive theme (big missed opportunity not having a Rey/Ben theme), but if you listen to the whole score (not just the soundtrack presentation) it is really quite an exceptional work, on the whole on par with TFA (and actually better in many regards).

By the way, Poe does have a theme that’s not March of the Resistance. Why doesn’t Finn? I mean why didn’t Han have a theme until last year?

As for the triumphant force theme during Luke’s death, that’s kind of the point. It’s not supposed to be a depressing moment, he’s becoming one with the force.