The ending is a nice touch, but I didn't care much for the characters, and was mystified by how Garbo was nominated for an Oscar after butchering so many lines. This is one of those movies that really does feel old, complete with comical special effects on a toboggan slope (I believe the one outdoor scene in the movie) with an obviously filmed backdrop, a look you now see parodied on shows like Saturday Night Live.
A couple of nice quotes though:
"How would you like it if I drink to what I see in your eyes, and you drink to what you see in mine?"
"Let me tell you something that I hope you will remember. Yesterday is a dream we have forgot. Tomorrow is the hope for some great happiness that will never come. Before, behind - just clouds and shadows. Nothing is real but this little minute that we call today."