If you only love American cinema and hate everything not English, you'll hate it.
If watching Ringu makes you feel that you somehow know a lot about foreign movies, you'll just sit and compare the two. Which is too bad, because they're both great in their own right.
On it's own, Ju-on is fantastic. It boasts itself as a simple contained story without stretching on into some sort of epic. Where some movies will say: "We've got a weaved story that's real creepy", Ju-on seems to say: "You came to watch a ghost story, and that's what you're getting. Now sit there as we shove your heart through your butt-hoop."
Folks, if you have issues with dead stares and good use of dark angles and sound, it's extremely creepy.
Studios aren't giving Sam Raimi millions of dollars to re-make this film in Japan alongside its original director for nothing. If not my word, take their's. The only reason this film got noticed in the first place is because of its original two-part TV airings in Japan that created such a buzz, they re-shot it for film.
-- Or maybe you'll take the advice of people who've watched too many brainless popcorn summer movies and never watch it. Ju-on's an Excellent flick.