Is parasite really good?

It's definitely a satisfying watch, with a good build up and great pay offs. When all the critics are saying it's put together like a true masterpiece, and the public generally think it's great, then it's definite;y worth checking out.
And don't be put off by the subtitles (the 1 inch hurdle, as the director called them) - thinking back on the film, I can't remember thinking about the subtitles even once.