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Well, I think Finn also has potential in the Force, which is why he missed those hits because he underestimated his opponent.

I agree. But it's still not a valid argument. Let's imagine a battle with some young Padawan – they would have much more experience with a lightsaber, and their potential might not be any less. How long would he last? It's a rhetorical question.

Because he's a typical villain from a typical fairy tale.

Yes, and he's a typical hero from a typical fairy tale. In general, all these moments can be explained in this way... But after a few good moments, I was already convinced that the whole film would be like that, and I was a little disappointed at the end, let's say.