The Power Glove was actually released in Japan first, by a company named Pax Corporation that died quickly after doing a massive ad blitz in Japan to try selling the glove.
It's even more useless in Japan that it is in the US however, because there's not even such a thing as Famicom Super Glove Ball. All you can do is try your best to configure the Glove with something like Mike Tyson's Punch-Out which is actually no mean feat with the wide-screen TVs most Japanese dudes use today.
As a result of this uselessness (or maybe despite it), the Glove doesn't go for much these days; maybe 3000 yen brand new. As a result, I'm very glad I spent.. um.. 200 yen at a flea market for this and nothing more. Ah well.