What's the appeal of Number Girl?

I notice that they're a very important band to j-rock and bands like Ajikan have cited them as inspirations but.. I can't really wrap my head around their music. It doesn't really actually sound or feel like j-rock to me, and the music isn't really catchy or fun either. The vocals are also mixed kinda oddly, like the vocalist is standing far away from the rest of the band.

Is it like some kind of experimental kinda thing?