The Sound of Music (1965)
Recently I watched this movie for the first time and I absolutely loved it. It's very rare that a three hour movie keeps me engaged like this. The settings are gorgeous (it has to be the most ghibli-esque live action movie I've ever seen), the song sequences are nice and the character development is great. I also like how it is willing to show some nastiness alongside the wholesomeness (e.g.: >!Liesl's boyfriend leaving her to become a nazi soldier!<). It makes the wholesome parts look real rather than naive.
So yeah. Great movie. I really can't find anything negative to say.