Depends on how old the graphics are. I don't think anything from early to mid 90's can be scary in terms of looks, everything is a bunch of boxes. Hah. The atmosphere is a whole other story, even Doom had some eerie levels.
As for OP, you're being unfair. You've shown a profile of the new alien, and 2 images of attacking "old' aliens (Heh, I remember playing that game back in 2000 or so)
The situations are completely different. Your older alien images show them in a way that enforces the viewer to consider them a threat, especially when said viewers are familiar with the general story and the way most video games look and work. The new alien is just a static profile.
So, uh, it's a bit unfair there. And the new alien looks better.