Pretty complex question. Humans with rubber masks are detestable. A necessary evil when CGI was really expensive, but now there's no excuse for it. It's acceptable in video games if there are many alien characters and they all have to be able to go through doors or up/down stairs designed for humans. I like my aliens alien and plausible. Yaphit's species doesn't seem plausible. Should have more differentiated cells and recognizable organs. Not a fan of evil reptilian or insectoid aliens. Seems a bit cheap to base them on Earth creatures that humans find creepy. Psychological differences are more interesting if the balance is right. If all members of a species share to the same ethos it's cheesy. If there is too much diversty they're hjust ugly humans. There should be more Vulcan/Romulan situations in SF. One species with two (or more) very different cultures.