I can't stand most modern musicals and I don't love older ones either, but the dancing in certain scenes was still impressive. I saw this movie on live TV, so I didn't seek it out on my own. I would say that it's not a necessity to watch, but that doesn't mean that I don't like it. For a musical, it's pretty good. Definitely a WWII film.
Note (Unrelated to the film): I'm just adding a note so that anyone reading this will keep in mind that my review may not be as reliable due to my age and I certainly may be misunderstanding parts of older movies especially (Even though most of what I watch are older movies). I am not an adult so my knowledge and understanding of films is apt to change with time.