Since when do we like our Star Wars original? Star Wars has always been pretty derivative. When it didn’t have the previous instalments to rip off, it ripped off Kurosawa and Flash Gordon.
Taking a few story concepts, such as uptight princess rescue element really isn’t much of a Kurosawa rip-off. It is pretty much an element found in ever third fairytale.
Character such as Vader and Tarkin in my opinion relatively very unique. Not to mention all the other relatively unique stuff and concepts such as death star, the force, lightsabres, spaceship designs, stormtroopers designs, creatures, etc. I said “relatively” because one way or another you can find something similar somewhere and start a petty argument.
On the other hand, TFA directly copied stuff. They didn’t bother to come up with new designs/concepts. We still have the same TIE fighters, X-wings, stormtroopers, etc. We have a bad copy of death star. We have family member plot twist. Etc.