Obviously a bunch of stuff is left out, they can't make a 10 hour movie to include every single plot line from the book. Make your peace with that now or don't go and see the movies!
The movie looks great! It feels more like a real world than an imaginary one. The movie is also quite hilarious!
I do, however, hate the added scene with the attack on the Burrow. It was incredibly pointless other than to jam a little "action" into the story. I never really felt danger in the scene, and right after it they're back at Hogwarts saying, "Whew, that was close."
But all in all, this is my favorite so far, and I'll go back to see it again because even at 2 1/2 hours this movie flew by! I was shocked how fast it went.