[SmG Battlefire]

Wasn't Luke classified as a Jedi? Didn't he use emotion?

Yes, you are proving my point. He used anger to beat Vader in their second duel. Was it the way of the Jedi? No. But Did he didn't submit to the Dark Side. Darth Sidious couldn't trick Luke in joining the Dark Side even when Luke used anger.

Again that is why the Jedi are flawed. Their weakness is not using emotional feelings. They're so paranoid thinking that anger is the way of the dark side.