I always thought it was great filmmaking to have Vader duel Luke one-handed on Cloud City.

While Luke is trying his hardest to hold his own with two hands, Vader is effortlessly making a fool of him with one hand (until Luke gets a hit on him, after which Vader loses his composure a bit). So much is said in the fighting style throughout that duel.

I feel similarly about TFA. Kylo’s fighting is obviously not masterful like Vader’s (I feel like Kylo knows cuts, but not so much proper dueling) but he obviously knows more than Finn who is on his heels for the entirety of their fight. Rey is also on her heels until she really connects with the Force.

Kylo shows a lot of the brash overconfidence and flash of a wannabe (or someone who’s acting like he thinks a Sith Lord like Vader would act) that’s never been properly challenged, and then when the Force manifests itself strongly in one of his opponents, his bravado and ability crumbles.