I found the cast perfect!
I know that there are many people complaining about the cast, and I respect different opinions. However, I found the casting to be perfect down to the last detail!
When reading the book I found that Nick was a little naive and liked to get easily swept up in extravagance, and Tobey played that role well. Leo was pretty good in his role as well and had great charisma (just watch Catch Me if You Can or The Wolf of Wall Street). It's easy to see how Nick would be fascinated with him. Leo has that "depth" in him which is a must for Gatsby.
I found that Carey Mulligan was incredible as Daisy! Daisy is the hardest to cast imo. You can't just scan through a sea of pretty Hollywood Mia Farrow faces. You need that magnetic ~Daisy~ quality which is both sweet and irresistible. Gatsby could have anyone he wanted but Daisy had that one quality which made him stay in love with her the whole time. It's that innocence, warmth and wonder that makes you forget about everything else. I don't remember the exact quote, but in the book it said something like "she gave off that promise that there was no one else she wanted to see more." I can't really describe it so I hope you guys know what I'm talking about lol. Carey was amazing as Daisy! She has this very unique and sweet face. From the very first curtain-blowing scene you know that THAT is Daisy. She gives off such warmth and unique electricity! And this once sweet ignorance ties in very well with the ending and Carey makes you understand why Daisy did it. The point of Daisy is that no one could know how conniving or selfish she was since she looked so sweet and promising. I know exactly why Baz casted her. She was truly the innocent "golden girl".
Elizabeth Debicki was amazing as Jordan as well. She has a period face reminiscent of Audrey Hepburn. She has that coldness and poise of that age. She represents Jordan's athleticism and elegance very very well.
Tom was well cast as well as Joel does give off that *beep* vibe the story wants you to believe in. Isla played Myrtle well.
You can tell Baz put a lot of thought into the cast and in my opinion it was spot-on! Each character gave off their personality beautifully. If the characters from the book were materialized, this would be it. Does anyone agree?