These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fanon Discontinuity: Fans of the second film could just view it as the Grand Finale of the Karate Kid franchise while ignoring the rest that follows completely.
First Installment Wins: While the second film received its fair share of positive notices, the first entry in the series is the one that everyone remembers. The first film's impact was so large that Pat Morita earned a Best Supporting Actor Oscar nomination.
Took a Level in Jerkass: Daniel, while having his share of flaws, was still likable enough. Which is why it was baffling to see how the first and second act of the third movie took away every quality that made the audience want to cheer for him. Thankfully he came to his senses during the final portion of the movie.
Critical Research Failure Dre plays a mean DDR. Mei Ying then proceeds to beat him, by standing away from the screen, facing Dre, and focusing on upper body dancing. Completely disregarding the fact the way D D R works is that you follow the instructions on the screen. So unless she knows the song backwards and blind there is no way she could've gotten a high score. That said, Reality Is Unrealistic. There are plenty of videos of people playing DDR blindfolded that are a quick search away, and playing in a turned-around position wouldn't be that far-fetched if she was really that familiar with the song. Given, that probably happened to be the one song she had totally down in that way on the game, but it's far from impossible if someone really good at the game cared to put the work in.