My main issue with prequels is that generally speaking, they're attempting to build suspense when the audience already knows how it ends. It's like, you know how Star Wars Episode III ends, and it wasn't like it was going to have a twist ending or surprise you in the end (twirling/leaping CGI Yoda or not). I'm sure Rogue One will attempt to be an interesting journey but the destination (stealing Death Star plans) seems pretty set in stone.
And really, the Death Star? Again? For a third movie essentially?
And if you remember the beginning of Star Wars, none of the Rebel forces can hit the broad side of a barn at 5 paces with a blaster anyway.
Though maybe the Rogue One guys actually know how to aim and lead their targets.
And sure, I'll watch it anyway.
I guess I'm more keen on the possible Bobba Fett and maybe even a Darth Maul spin off movie, something where they build back story for an interesting, cool-but-marginalized/underdeveloped character.