You might assume that Simon Rich’s Broadway debut, “All In,” whose subtitle promises “Comedy About Love,” would join this honor roll. But this new production is a slight affair that’s as easy to forget as it is to watch. Theatergoers likely to get the most mileage out of the show’s 90 minutes at the Hudson Theater are those who bust a gut reading The New Yorker’s Shouts & Murmurs section — they must exist, right? — where some of this material has appeared.