Crap, little screentime or no.
Mr Black had more than enough screentime to get something, anything, across. He had no personality. It was the worst kind of suit acting - one where the guy doesn't do anything other than exactly what they're told to do. "You see him, pause a bit, then run over", and that's it. No little ticks, no mannerisms, just run from A to B.
They're portrayed as monsters, not characters, which is exactly the opposite of what Stan Winston spent his entire career trying to do.