Yeah, that is exactly what I meant in my previous post. The acting style seems exaggerated by today's standards.
It's not easy to do, but if you can try to imagine yourself back in the same era, and judge the movie as if you were, it helps.
Also, it can help, as you pointed out, if you are able to look at the movie with a historical eye ("ah, this is how they acted back then," look at the style of dress, look at what they considered "handsome" in a male and "beautiful" in a female, dig the cars, the slang, etc.).
RE: The nudity. Broadway Melody was made "pre-Motion Picture Production Code
(scroll down far enough to click on the photo from "Sign of the Cross"). There were some pretty zesty movies made pre-code.
Turner Classic Movies has two pre-code collections:Forbidden Hollywood, Vol. 1Forbidden Hollywood, Vol. 2
Vol.2 has a documentary that sounds interesting. "THOU SHALT NOT: SEX, SIN AND CENSORSHIP IN PRE-CODE HOLLYWOOD (2008): Over seventy years later, they've lost none of their power to shock, entertain, and titillate. So-called pre-Code movies remain among the most vital films America has ever produced. But why were these films so much more sexually free and socially critical than what came before or after? Who created the Code, and what did it forbid? And why did it finally become a Hollywood commandment? The answer is a fascinating mix of scandal, big business and social history - a unique collision of events that resulted in one of the most dynamic - and delicious - periods in Hollywood history."