That battle basically is the ending. There's not much after it. To say the rest of it disappointed you with what little happened doesn't make a whole lot of sense.
I was expecting more from the dark Link ( I think u know what i'm on about ) seriously, he was mentioned once ( with a very crutial backstory ) and is never mentioned again. It would've been good to battle him. ( also that spider thing that Midna turns into when she uses the fused shadows, I so wanted to battle it so much , when it's breaking open that seal thing , allowing you to get inside hyrule castle, it was looking like you had to battle it ).