I had the same reaction as you. Why burn down The Burrow? Does this mean no wedding for Bill and Fleur? That’s a huge scene in DH.
I couldn’t believe there was not battle at Hogwarts either. The Deatheaters just walked away and no one tried to stop them? That bugged me, too. I guess it will make the final battle for Hogwarts in DH that much more exciting, but I missed it.
It wasn’t horrible, but I guess I expected something different.
I also wanted to see Snape say, "Don't call me a coward." Because that was so powerful in the book. Oh, and I love Rickman.