Weak compared to some of Hitchcock's others
I'm a huge fan Psycho, North by Northwest and Rear Window, but having only watched this for the first time recently, I found it very hard to enjoy. Maybe the premise of it hasn't aged well compared to the other greats of his, but I can see how it would have been terrifying being seen for the first time in the 60s.
To me what makes the likes of Psycho and Rear Window all-time greats is that they are timeless and (even with dated technology and special effects) the story is still believable, but personally I don't think The Birds falls into that category. The story is long and drawn out, the acting isn't brilliant and the characters don't react realistically