They are not re-inventing the wheel here, each one exploring what many consider to be tropes of the saga by now but they are done with such gusto and aplomb it would be churlish to sneer. Besides, that is not something a gentleman does.
Each one is short but uses their screen time well, never outstays their welcome and quite frankly just leaves me hungry for more. Which is the intent I suppose. I am hearing the classic and ageless Jerry Goldsmith Alien original soundtrack in the empty theater of my mind as I type this..