"21" is my favorite gambling movie I can think of at the moment. They are a team of card counters led by an MIT student who wants study medicine. He is recruited by his math professor and goes to "play" in Vegas with the team until they are busted.
"21" is a very great movie. It is inspired by a true story of a student from MIT who was a genius.
In addition, I love Casino Royale as well. These gambling movies make you fall in love with gambling or at least explore your talent in any field you are capable of.
Moreover, it shows you how fake the is the face of the house. You are always under the eye of the house and in case you are winning, you are dragged into things that will disturb you to the roots.