This was a defining episode of Seinfeld. How many other shows could have an episode about a piece of candy and make it not seem ridiculous? Fellow Larry David laffer Curb Your Enthusiasm is probably the only show that could do such a thing.
The episode as a whole just worked. It was fast-moving, it was funny and featured some great Jerry/Kramer chemistry, something that disappeared for the most part in the later years of the show. This was also the first appearance of the doctor, who would go on to be a crucial part of this shows storied history.