I've seen it, but I was a film major in college so I've screened a lot of "critically acclaimed" films. Of course, I watched the movie post real life "Soong-Yi scandal", so I saw it from a different perspective than those who viewed it in theaters back in 1979. Woody Allen plays a middle aged man who is in a romantic relationship with a 17 year old. Hmmm. Obviously the character he created was based on himself.
Pretty much most post 1965 or so films that are made in black & white are done so for "artistic" reasons. I'm usually neutral on it. (I did think putting the rest of the movie in B&W but the blood and little girl's hat in color for the filming of "Schindler's List" was over the top, though. Okay, Steven Speilberg, the holocaust was horrible, we GET it)
Woody Allen's late 70s and early 80s movies are mostly whimsical romantic comedies. I prefer the early-to-mid 70s Woody Allen era, when his movies were "zany comedies" instead. My favorite Woody Allen movie is Sleeper (1973). I'd much rather watch that than Annie Hall or Manhattan.