I think the word "Humanoid" is the greatest gift the genre of space travel science fiction has ever gotten, it enables the creators to introduce alien life without resorting to ridiculous designs or making it look like an animal or a bug, a lot of movies and shows haven't utilized the word and they always end up with something that looks silly to me, even critically acclaimed movies like Aliens, E.T. or Independence Day, IMO.
TOS made good use of the word, aliens usually looked human for the most part, save for an odd skin color or bigger heads which are okay. I've had that thought a while back watching TOS and the reason I bring it up now is the alien designs I'm seeing on TNG, these Ferengi mofos are just so damn stupid looking and it almost pulls me away from the seriousness of the plot, let alone the Selay and the Antican from the episode Lonely Among us that I just saw.