In the world of sci fi there are a handful of gold standard movies, the 2001's, the Alien's, and a much, MUCH larger group of really bad rip offs of these movies. Only rarely do you encounter ones that fall somewhere in between, but Puppet Masters fits that bill. It is not a great movie. But neither is it awful. I have certainly seen many many sci fi flicks that were much much worse.
While its based on a different book, this is basically the third, and least effective, version of Invasion of the Body Snatchers. And it does a reasonable enough job of building suspense that its strong source material can carry it along. Its not as good/scary as the original Body Snatchers, nor even as good/scary as the remake, but its still pretty decent sci fi. Heck, it even gets a rare decent performance out of Donald Sutherland, who for once does not appear to be mailing it in. The movie is marred by a weak ending, but if you're a sci fi fan its not a bad little time waster.
While its based on a different book, this is basically the third, and least effective, version of Invasion of the Body Snatchers. And it does a reasonable enough job of building suspense that its strong source material can carry it along. Its not as good/scary as the original Body Snatchers, nor even as good/scary as the remake, but its still pretty decent sci fi. Heck, it even gets a rare decent performance out of Donald Sutherland, who for once does not appear to be mailing it in. The movie is marred by a weak ending, but if you're a sci fi fan its not a bad little time waster.