Prometheus and Alien Covenant I would argue are better than Alien and Aliens.
There's a reason why all this hate for Ridley's prequel films has come out of the woodwork. Prometheus had a mixed critical reception, yes, but was still a huge box office success. The promise of another movie like Aliens appears to have certain segments of the population satisfied with nothing but this coming to fruition.
This encapsulates it all, really:
Not that everyone is like that, but if you don't acknowledge this trend you are basically ignoring the elephant.