As a single movie maybe a 4-5, but of no value at all for the franchise or the sequel trilogy.

Rating: 3/10 (18 March 2020)

The movie is not actually terrible in some places. It's a fantasy adventure action movie with albeit featureless characters and unmotivated actions though, but not much in the way of a Star Wars movie. It's just incredibly generic and bland, you could probably have put the same story into the Xena franchise and made a more interesting movie from that, as it's gotten less of a space fantasy movie and more of a high fantasy narrative.
The narrative connections between TRoS and the other two sequels are... pretty much nonexistent except from an interpretational point of view. You could very well have forgone with the other two movies - or with this one, as it's the least structured or well told of them all.
Some MacGuffins could be taken directly from a badly written text adventure.
The actorial chemistry between Daisy Ridley and Adam Driver works very well though, while the other characters don't really show any life of their own, being the punchline of one or two or nostalgia jokes aside.
The connection to the franchise as a whole is... to say it mildly... stupid and infantile. The premise, which ties it into the saga, is off from the get-go, starting with the rolling title. After that, one logical and dramaturgical inconsistency ties itself to the last. With these inconsistencies comes a strong notion of weightlessness to every action or character in the movie. What was a dire danger or loss in one moment, was completely restored or resolved in the next.
So all in all: No recommendation from me - and a sense of bewilderment about the rating of 6.8 on here.