A visual and audio masterpiece.
A fairly flimsy plot.
Some weak character development and characters. Except for David who shines in his robotic "HAL" like autonomy.
Overall still worth a watch despite it's flaws.
For a contribution to Sci Fi, a head above most Sci Fi Flicks.

What always bothers me with the alien films is creatures from this cannon mysteriously grow to phenomenal sizes without really consuming an energy source. How can you mysteriously grow so fast and gain so much mass without eating and shitting a shit load of extras?.... does not compute (refer second to last creature).