Of all the movies, this one follows the book most closely. It removed the scenes that weren't needed like Fluer, but kept the important scenes that move the plot forward.
The biggest let down is the missing fight scene at the end. Why did Draco sneak the Death Eaters into the castle if there if there was no final battle between the Death Eaters and Dumbledore's Army? I can only hope it relates to the next movie.