I thought it was definitely funnier with the subtitles, because I could figure out what was going on. Not that it helped the movie's plot all that much, but it made it more obvious what the riffs were about.
Yeah, that's why I try to include subtitles whenever I'm making my reauthors. I'd just settle for closed-caption, but the TV in my bedroom is so old, it doesn't have CC on it. Which is kinda funny since my wife got it from a couple with a half-deaf husband.
So yeah, subtitles are neat.