Picking on aliens not alien enough is a common pastime among people with a bone to chew when it comes to science fiction. Certainly not the last, but the most recent (that I know of) is Neil deGrasse Tyson, who just like all the others think aliens have to lack faces, an even set of limbs, etc, to be alien enough to qualify as aliens.
My problem with this is most of the film or book alien aren’t there as true aliens. Anyone thinking that doesn’t understand the basic premise of science fiction. At all.
True, some aliens are there to be 1000% ALIEN. Alien (the film) itself is a point in case. The Crystalline Entity, of Star Trek fame, is another. But they are fairly few, and in most cases they are symbols of Evil, or at the very least the truly undecipherable. But the wast majority are humanoid, seductively similar to us. And the ‘seductively’ part is the important one. Because it is in the way the ALMOST like us actually differ, and how we handle this, that forms the backbone of many a science fiction story. And in this it isn’t a story about foreign planets and peoples, but about us – humanity – and how we handle change, and how we interact /or not/ with people different from ourselves. Science fiction in this sense is a looking glass or a mirror, reflecting our own behaviours and customs, forming an arena for inspection and criticism, for questioning certain behaviours and world-views.
In these stories the aliens has to be reasonably humanoid or the point of it all is lost, or at least buried deep enough for it not to get through to the majority of the readers/viewers.
In this light it is totally reasonable for the atevi (Foreigner/Cherryh) to be humanoid in general appearance, just like the mri (Faded Sun/Cherryh), or the ferengi or the klingon or the andorians (Star Trek) or the Na’vi (Avatar). Just to name a few.
Picking on unalien aliens is thus so far besides the point a gas giant can pass through the resulting void. If doing it makes you happy – please continue, but don’t expect to be taken seriously by anyone.