Honestly, though, as long as the writing is fine, I don't see much wrong with this. Other language speakers deserve to experience the magic of MST3k as much as we do.
If watching Russian wedding footage off of Youtube has taught me anything, five minutes in these three are going to wind up drunkenly fist fighting/firing guns at each other. Then the movie is stopped because someone is fatally wounded.
From the comments: "If your wondering how they got the rights and other legal facts, just think to yourself 'its just a show I should really just relax'."