I liked everything about the final scene except for the idea of the scene itself, by which I mean that the movie is structured to be bookended by fanservice to the OT. The opening crawl teases Luke’s eventual appearance, and the final scene reveals him. Through the film we are given the idea that he’s a great Jedi and the Jedi are important and magical, but one small problem with this is that he’s reduced to practically macguffin status, like the Death Star plans. Luke’s power is never shown in the film, only told through exposition.

The bigger problem takes more explanation:

The enigmatic nature of Luke in the final shots most closely mirrors the end of ESB, where Luke is left pondering a big question regarding the nature of his father. Both films clearly lead into their sequels, but they are different in that the audience is given a clear problem at the end of ESB. Luke became a Jedi because of his father, so if his father fell to the Dark Side, he could as well. Also, he is expected to destroy Vader, and if Vader is telling the truth, Luke would be massively conflicted about his entire quest. This is the nature of the film’s end, a very precise obstacle for our hero to overcome.

However, the end of TFA leaves the audience with no revelation, no clear problem. Rey finds Luke and holds out the lightsaber. Will Luke accept it? Will Rey become a Jedi and confront Ren? Is Rey Luke’s daughter? Yeah, probably, is my answer to all of the above. But why bother thinking about it? There is no obstacle here for Rey to ponder. This is no second act reversal, but a first act victory like ANH, and in this case the film should have ended on the shot of the Falcon leaving the base. But TFA wants to be a mashup of ANH and ESB, so it has both endings, with neither being particularly strong.

TL;DR version: Luke is a not-so-interesting macguffin, and the opening crawl and final scene is the beginning and ending of ESB tacked onto a functional remake of ANH.