“I don’t like TFA because Kylo is shown as super evil and skilled din the beginning, but then it turns out that he can’t do anything.” - "I don’t like TFA because Kylo is not threatening enough in the beginning and only does something impactful towards the end."
Ask ten people why they didn’t like TFA and you will get ten contradictory answers.
Well, they are ten different people; they’re bound to have their own differing tastes and biases …
Yeah, but if there really was a big underlying problem in the movie, these complaints wouldn’t contradict each other so much. Among the people who don’t like the PT, there is at least a general consensus about what exactly is bad, not someone saying “Jar-Jar was stupid and unnecessary!!!” and the next one saying “Not enough Jar-Jar scenes!!!”.
In the case of TFA, it’s all about personal preferences and interpretations, not about things that are truly objectively bad. Notice that I didn’t say “what they don’t like about TFA”, sure you may not like villains to have a personality apart from being evil, but this doesn’t mean every movie that has such a villain is bad.
PT preferences had many years to consolidate, while TFA just got out, so people are still figuring out what specifically is that they didn’t like, and if it’s a subjective or objective problem. By now, you could say both of these opinions on Kylo point out there may be a problem with how his charcter was either written or executed.