There were a number of things that kept me from liking this as much as I wanted to, perhaps none bigger than the execution of the central premise: stealing the plans for the Death Star and, despite all the fanservice bits, the failure to capitalize on A New Hope's beginning where Darth Vader tells Princess Leia "You are a traitor and a Rebel spy!".
As a result, the film didn't have any real espionage or caper flare to it and settled for some unlikely "intergalactic library/city hall" to barnstorm which, ironically, seemed to be condoning the early days of pirating on Napster and uploading/downloading files illegally. It's just one of many head-scratching decisions that defied logic, logic in this case being one would think the place to acquire blueprints for a functioning Death Star would be, well, the Death Star itself. Everything about the location used felt forced (pun intended), right down to some force field opening above the planet that required yadda yadda yadda. I think the narrative could have been a tense thriller for the first half in acquiring the plans, then the last half where it's about escaping with them which could have easily involved the same type of big, climatic battle with the ending as is.
The other bits, right from the start, included such things as Krennic's arrival to bring Galen Erso to work on the Death Star. Sure, it looks cinematic with these Black Deathtroopers striding ominously forward with Krennic's contrasting white cape fluttering in the wind, but I couldn't help be reminded of human nature and wondering had these fellows stopped at the local mall, would they have parked three shopping plazas away and walked? Of course I'm being sarcastic, but it was one of those little things that made me say "Why?", along with Galen's wife's death or Saw Gerrera's inexplicable "I'm tired of running" and giving up bit. It just didn't ring true and all seemed to aim for hollow/forced emotions (coincidently I found the whole rather emotionally uninvolving).
There were bits I did enjoy, particularly the decision handling the cast of characters, and overall didn't find it bad at all per se, just something that fell short of its promise - especially with a lot of scenes cut from early trailers which gives some idea of how much tinkering went on (I'd really love to know how much Gilroy's influence changed the film and where it stood prior.)