Is he really so lacking in imagination that he thinks "snarling" is all there is to the Alien? I'd like to imagine it's a quote which has been taken out of context, but given all the strangely off tangent interviews we witnessed during 'Prometheus', I can sort of believe he literally meant it. He's technically proficient, sure, but the creative passion seems to have been left in yesteryear.
This is the same guy who felt bald albino men would be better and more interesting to see on screen, than the original Space Jockeys. The same guy who wanted the 'bio' removed from the 'biomechanical' aesthetics of the Engineer sets.
And, most hypocritically of all, was saying this same stuff about the Alien, while 'Prometheus' was being made - only to wind up including the far inferior (and fake-looking) Deacon, because... What? He found that scary? Impressive in a way Giger's creation somehow couldn't be?
Yes, the Alien's been over-exposed in popular culture, but portray it in the right way and the magic is just as potent as it's ever been - something which hasn't been done successfully for something like thirty years.