"Watch the skies!"
1000 Misspent Hours calls it "the world’s first alien paranoia movie, the film that spawned the entire “commies from space” sub-genre in the 1950’s". Moria agrees it's " the very first alien invader film" and "one of the best." Slant Magazine says, "The Thing From Another World's titular vegetable creature may not have the cache of a Freddy or Jason, but there's no denying that this chilling Hawks production is a must-see for science fiction and horror aficionados." Only the Cinema has a post.
4/5/2009: SFSignal is featuring it in their Sunday Cinema post.
5/26/2009: Ferdy on Film has a review.