It won't be the last time I'm standing by myself when the room divides.
I know that feel.
I won't argue with anybody who doesn't like it for that reason, or the lack of characterization, or the purists for the lack of all the Force/Jedi mystical stuff. I can see those weaknesses, objectively speaking. They just don't bother me as much.
Having said that, Ep. IV has a lot of the same issues. The characters were pretty thinly drawn. You've got a naive farmboy, a damsel in distress, an outlaw with a heart, an old wizard, a masked villain....it's all archetypal and that informs us who the characters are, but that's an easy trick to disguise the fact that there really isn't much depth of character going on there.
And outside of the amazeballs opening scene of the Star Destroyer chasing Tantive IV, there isn't much of an action scene until literally halfway through the movie when the Imperials find them in the detention unit and the gunfight starts.
And it should be noted that original reviews and returns on that movie were not very good. I think Rogue One is similar in a lot of ways in that it is a slow grower. Once you see what happens in the end, you're more likely to care about the characters, so that the next time you watch it you're more engaged in the backstory/buildup stuff.