It has a shit ton of fan service to please those who saw the original trilogy back when it launched (to which I'm immune since I can't be nostalgic for something I never lived).
Maybe that's the thing.
I see a lot of people who don't have much of an appreciation for the films, events and characters of the original trilogy, and have big fondness for the prequel trilogy (which, as someone who came from the original trilogy, I find it veeeeeeeeeery weird
).
Personally, I'm of the belief that if Star Wars is the pop culture phenomenon that it is, and is still talked about 40 year later, it's because of Luke Skywalker, and Leia, and Han Solo, you know, the characters (and the actors behind it), a human element, and not just the lightsabers, the cgi effects, and other stuff.
I don't feel that bringing back these people, and making them a part of the events, is something negative. I mean, this is a sequel to the original trilogy, and a lot of people, like me, wanted to see these characters back. That's the whole point of a sequel.
I know some people feel differently, and apparently see this "fan service" as negative, or as a pure nostalgic exercise, because of that good old "ageism" that apparently makes anyone above a certain age irrelevant, and only good to come out to be killed as a plot point, and nothing more.
But, I'll do say the following.
I went to watch all of the 3 films from the sequel trilogy in packed theatres on opening night. Packed rooms with younger people, older people, parents with kids, fans with t-shirts and dressed as characters, and non-fans that were usually "dragged" to the films by their parents/husbands/boyfriends/(...).
The mood after Episode 7 was great, people enjoyed it, got a kick and reacted during certain events and characters (not only when some old characters came along, but when new characters did something cool), people clearly had fun with it.
On Episode 8, people ended up the session... apathetic. None of the enthusiasm was there. Not even from the people who went in full costume.
With Episode 9, the mood was, like with 7, of joy and fun, but even more so. People cheered, people cried, and people went berserk in certain moments, including that last scene. It was great to see a whole room, including my wife (a non-fan, who loved the new movie), and people of different generations reacting very positively to the film.
It felt like an "event" film, like plenty of 80's/90's pop-culture classics were, and not like most crap that passes as a big production nowadays.
On another thread, I had someone react negatively because I said I had a lot of fun with the new movie, as if "fun" is something meaningless. You know what: it is important. And something I find lacking in many of Hollywood's recent output.
So yeah, maybe people with a big fondness for the original trilogy, and who didn't care more the prequel trilogy, will get more enjoyment out of it.
You will see plenty of characters and actors from the original trilogy, as well as references to events and places from them.
If it's something you feel it's positive, and you enjoy an old school space opera, I would say you will probably enjoy the new movie.
If you don't have much fondness for the original trilogy, and enjoy later entries in the series instead, maybe you won't get as much out of the movie.