I thought TFA was great in spite of being derivative, but I really hope Rogue One is put together well. It has the potential to be the type of Star Wars movie I want to see -- more about the gritty underbelly of the universe, about soldiers and smugglers and pilots, about ordinary people called on to do extraordinary things, more so than Jedi and "A space wizard did it" (minus what appears to be the obligatory superweapon).
Ultimately it's all in the execution, though.