While much of the film feels somewhat "cold," DiCaprio is the emotional touchpoint for the audience - he's a tortured man, not only due to the separation between him and his children, but the death of his wife, with whom he was very much in love. While the male members of this little band are oblivious, Ariadne becomes aware of these deep emotional issues that Cobb is going through - and the fact that they are so deep that they may seep into their combined dream world and risk not only the mission but all their lives.
Christopher Nolan has crafted an incredibly complex and layered film that although it runs just about 2 1/2 hours, does not feel like it's that long due to its excellent pacing. That is not to say that it moves at breakneck speed, but that the film opens up before you like an architectural marvel, with something more fascinating and engaging in the next room than the one you're currently in - with every subsequent room being more interesting than the last.
If you still picture DiCaprio as the kid in Titanic, you really need to update your point of view - he's turned into a solid, gritty actor with an air of gravitas. Everyone gives excellent performances here... Joseph Gordon-Levitt is suitably intense, although he's not given much to work with. Ellen Page was good, not great - but again, she wasn't given enough to do to really let her spread her wings. I particularly enjoyed Tom Hardy's character and performance - he was the guy that really understood how to cut loose in the dream world.
Hans Zimmer's music fits the film wonderfully, helping to carry along the story and pacing. Nolan's cinematography was beautiful and creative, and some of the visual effects scenes (in particular the floating hallway scene from the trailer) makes similar scenes from The Matrix look old school (yes, I realize The Matrix is over 10 years old now).
It's one of those films that warrants multiple viewings to let everything sink in. Is it absolutely perfect? No, but any minor issues melt away in the overall experience of the film. It will entertain you while at the same time challenging you. And all without the gimmick of 3D. And for those of you going to see this based on your love of The Dark Knight: While Inception is a different type of movie, the latter is indeed better than the former. If you're hungry for a film that has action, mystery and respects the audience, I highly recommend you go see Inception.
Inception is rated PG-13 and there is nothing too objectionable for kids, although if you bring children under the age of 10 or so you're probably wasting your money as this is not going to be their cup of tea.
If you want to discuss the film in all its detail without worrying about spoiling it for those who haven't seen it yet, and want to discuss what really happened in the film, head on over to our Inception Explained Discussion article.
Finally, I'll leave you with our very own custom-edited, extended Inception trailer: