I thought Rogue One was awesome. It's a great stand alone movie, but I also think it's a great companion piece, or prologue to A New Hope. For me, it puts the film in a whole new light having some history to the events leading up to it. That's something I don't think the prequel trilogy really did at all. It's just full of stuff I wish I could forget.
Agreed. It was a great companion to the original and enriched the lore of the movies I loved as a kid.