The characters were definitely good IMO but most people who like Star Wars saw it when they were kids and have liked it since. I think stuff like lasers and lightsabres were more important possibly than it's given credit for. Some characters are kind of hard to separate from the icing in ways too. Maybe that's looking too far into it but a big chunk of what made some characters interesting was aesthetics, like Yoda and Vader. If that makes sense. Probably not. Is the icing supposed to be equal to the cake in this analogy?
I don't know it's hard to talk about these movies because I have no idea what my opinion would be about them if I'd never seen them until say, yesterday. Also this is obviously kind of unfair but the characters A New Hope don't become that interesting until later movies.
As I said previously I don't think that necessarily makes for a bad movie if the characters don't provide much of a conventional connection. I kind of liked it in this one.
Personally, I think there's a misconception about the difference between aesthetic value and childish novelty. If special effects are amazing, that doesn't necessarily mean that a movie is visually strong-- in fact I would argue that that's a very tiny part of it. Also, something that is aesthetically brilliant has a sort of timeless value of its own that is not any less important than story or characters.
A New Hope and The Empire Strikes back were aesthetically brilliant, IMO. This is not only because of the childish novelty of things like the cool-factor of light sabres, special effects, Darth Vader, and spaceships (if it were, The Force Awakens/Rogue One would be arguably as aesthetically/visually strong as the OT, which they're clearly not). It's also things like sound, atmosphere, mood, how characters look/feel, the rhythm/snappiness of the dialogue, cinematography/framing, colors, the poetry of how scenes are sequenced and presented, the wipes, the crawls, etc..... When you add all these things up, they make up a MASSIVE part of what makes a movie a movie.... and ALL of those things are aesthetic rather than content/substance, and therefore, in this analogy, would be lumped together with the icing rather than the cake. I would argue that the Star Wars franchise leans almost ENTIRELY on aesthetics to be worthy of being considered timeless/brilliant. And this is in no way an insult.
The actual character development, writing, plot, themes, etc-- the "cake"-- is more than serviceable enough as well, and good/tight enough that perhaps it withstands criticism, but I don't see any way to argue that these aspects of A New Hope or The Empire Strikes Back are brilliant or outstanding, without the influence of the aesthetics. I would argue that the opposite is true though-- The aesthetics are still timelessly brilliant without the influence of the substance. Even though neither area are outright weak, it's still a completely one-sided affair.
If we accept that icing = aesthetics and cake = content/substance, Star Wars is predominantly brilliant/mouthwatering/greatest-thing-you've-ever-tasted icing engorging solid/complaint-free cake, IMO. And yet those movies are still brilliant, on the strength of that icing. That's why I don't think the analogy works in the case of Star Wars.
It's reasonable and somewhat truthful to argue that Rogue One has a poor story, poor character development, poor substance-- FAR worse than A New Hope/Empire Strikes Back-- and that's what makes it a bad movie. However, to argue that it's a bad movie because it's all icing and no cake, to me, makes no sense.
Edit: Btw, Finlandia WOAT, if you want to argue that it's impossible to separate the two because the lines are too blurred between which is which, I can go along with that. The suggestion was brought up, and I only went along with the assertion best I could. I am not saying that either aspects are weak (the characters being like-able and engaging are positives, and the fact that they're shallow/stereotypical don't have to be negatives), but if you're suggesting that Star Wars is still a beloved/highly revered/considered brilliant thing after 30 years mainly on the strength of the substance of those characters, removed from how cool they look, I would not agree with you (aside from maybe Han Solo).