I don't think so. If the Xenomorph didn't have a mouth it would be significantly more boring to watch in movies or games. Why? Because it wouldn't look as terrifying nor convey a plethora of emotions in different situations.
The lack of facial expressions makes it a lot less terrifying. They could design glowing alien rocks as the most dangerous aliens in the galaxy. However that doesn't invoke fear and isn't interesting to look at.
The blob is one the most boring aliens ever designed.
They do, check the Zerglings, Hydralisk, Mutalisk, Ultralisk, Infestor, Drone etc. They have cool memorable designs with notable eyes and mouths yet still look alien. Not some faceless blob that is dull due to a lack of facial features.
Even the Overmind, which is a giant eye, has multiple expressions because the eye moves and the pupil changes shape.
The Protoss do and they're less scary for it because they're basically humans with prosthetics.[/FONT][/COLOR]
Not nearly as terrifying as aliens who DO HAVE FACES with facial expressions.
When the alien blob is:
threatening = same expression
angry = same expression
scared = same expression
hurt = same expression
amused = same expression
dying = same expression
A living rock or blob with deadly abilities is still a boring rock and blob. Because they cannot convey interesting emotions to humans.
This is why the most popular alien characters are not faceless blobs.
Mouth != expression. The mouth of the Alien expresses nothing. It is simply a mouth. It has no eyes, or eyebows. It's mouth can't display disgust or anger or anything, because it has zero emotions. It is utterly alien to humans, and its actions are what makes it terrifying. You're massively over exaggerating what it can display.
As for the Blob, it isn't just about its design, but what it instils, which is fear, and it does so without any expression or humanoid features at all, because of its actions. You keep ignoring the fact that fear and terror can come from actions, from what is utterly alien to us. Something doesn't need a face.
They don't. By definition within the hive mind the zerg display zero emotions. Just because it has a face doesn't mean it's actually expressing anything. They don't display fear or anger, simply the same expression constantly, and again it's because of the fact they can kill you in horrible ways that makes them scary, nor that they have eyes (which display no emotion) or mouths (which display no emotion). The Overmind is simply a looped animation portrait that doesn't react to anything. It isn't displaying anything.
Your claim of not nearly as terrifying is utterly subjective as different people get scared by different things. A living blob is still going to kill you, and it's going to be painful. Doesn't need a face to make that scary which is my point all along. I notice that you ignored the Mike Myers and Jason point, two people in horror that scary people without expressing anything at all.
The most popular aliens are so because they're interesting stories/design going into pop culture. Your xenomorph is one of the top aliens ever. Doesn't display jack with its face. Still scares people.
I get it, you don't like the design, but that's utterly different than saying that something can't be scary without a face. It can.