What can I say about Frosty? He's a magical snowman who comes to life! How much better can it get, really?
The animation was pretty limited and I enjoyed watching various objects blip out of existence for a few frames every now and then. The style of the art is very neat, though. Black outlines around the outside of characters, and colored outlines on the inside.
This particular Christmas special emphasizes the importance of friendship. Santa does make an appearance, but only to give the moral of the story and get rid of the bad guy. It's not about presents or any of the typical Santa-related subject matter. It doesn't even need to be a Christmas special to get across the message it conveys.
Nevertheless, it's cute... it's fun... it's one of those cartoons we all grew up on and has a special place in our hearts.