So I noticed right away that Obi-Wan slashing into something and using the smoke to temporarily blind Vader was a callback to Luke's fight with Vader in ESB, I just couldn't remember the exact context. It turns out that Luke sliced into a hose and forced the steam into Vader's face, to which Vader says, "Obi-Wan has taught you well." I'll award 1/2 a point to this nonsense for at least that clever bit of writing.
Actually, on second thought, that demonstrates that at least one of the writers are capable of being creative, which makes the rest all the more inexcusable. 1/2 point withdrawn.