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Watching more of his films can definitely help, but not necessarily. Many of Ozus films are very similar to eachother, in both in style as well as thematically. They are frequently variations on a theme, that theme being the interpersonal dynamics in families. Part of the power of Ozu's family centered films, and their similarity with eachother, is how much variation he can find within a limited template. I wasn't particularly impressed after I saw my first of his films either, but by watching a bunch, and then beginning to understand how subtle his style is, and how much of a whallop he can make with little more than a whisper, I became a fan.
But I think one has to first at least acknowledge what he's attempting to do, or show the vaguest interest in a filmmaker who employs the techniques that have already been mentioned here half a dozen times. If one doesn't want to acknowledge dramas built upon gestures and polite smiles as having any substance, yeah, his movies may not seem to have much value.
And since at no point is Setsuko Hara ever going to don a steely glint in her eye, and chew the stub of a cigar as she considers who to shoot next, some people are obviously going to have his greatness pass them by.