How bad is it? It's a fairly typical nudie of the time, altered for (mostly failed) laughs.
Should you see it? If you're a fan of Francis Ford Coppola or June Wilkinson. Unless it got a recent DVD release, you'll probably only find it on a poor quality 1980's VHS. I saw it in a theater.
The 1958 nudie "Mit Eva Fing die Sunde" was dubbed into English, changing the storyline to make it amusing - much like Woody Allen's later "What's Up, Tiger Lily?" - but aiming for a very different audience. New scenes were written to add to the film for the American release, which were filmed in color and in 3-D, directed by Francis Ford Coppola, in his first film. The only name (and figure) Americans might recognize is busty June Wilkinson, who I expected to be more "titillating" in 3-D than the film delivers.The plot has bellboy George, who wishes he were as expert with women as his friend, the director of a theater group, study to become a private investigator and then use his new skills to investigate the models of a lingerie manufacturer, who happen to be staying at his hotel; this leads to him watching them demonstrate how easily their undergarments are removed.