Well for me it was not as good as the other parts. No doubt the actors did a really good job but as to the storyline it didn't end well. None of the character was shown complete or satisfied like the other parts. The ending had a deep meaning but it was a bit confusing though. As per my point of you the first two parts were really made out of too much fun as well as satisfaction but this one did not hit it. In the end I was really disappointed that they didn't show anyone living their lives peacefully. They gave a message that Lee was getting married but then ended that too!!
What I observed was that in the first movie itself it was made clear that Noah and Elle were made for each other but they ruined this too.
What I suggest and really want is to get another kissing booth to finish out the story they created and left it incomplete.