Main game: Functionally serviceable but really fucking dogshit by the end. Marluxia phase 2 had me by the balls and i had a blast but i dont think it really teaches you how to play it right until Larxene and no boss really comes back to challenge you like her. It was pretty fun to break by the end

Reverse Rebirth: Incredible addition to Riku's arc. His gimmick is great and plays with the strengths of the combat while offering a unique challenge that Sora never has to face. The shorter levels makes the campaign tighter and the bosses are actually challenging and interesting. Worth it for it alone.