Good movie with a bad ending

Rating: 6/10 (25 July 2013)

This was the first Hitchcock movie I saw, and up until the last 15 minutes of it I thought it was a good movie. When you see it in the the 21st Century you have to think though out the movie that it was made in the '60s and that's why not everything is quite the way one would have wanted it.. The acting was mostly good and most part of the scenes had great camera angles and light etcetera.
The only bad thing about the movie was, like stated above, the last 15 minutes of the film. Why did she go in to the room, instead of just peeking in? Why did she not put up more of a fight with the birds? Why did the birds to this? And why so many different birds? And what happened after they drove off? I H.A.T.E. having questions instead of answers at the end of a movie.