Yeah. It's good. What can I say about it that hasn't been said already? I'd agree with the general praise that's been granted it: it's intellectual, exciting, creative, and it's not a sequel, remake, or adaptation. Those things are great, but don't they don't necessarily make a great film.
What's impressive is Nolan's literal exploration of what it is to dream and how he weaves those experiences into a compelling narrative. And it looks amazing as well. Like in his previous films, the CGI was kept to a minimum resulting in a very realistic looking film despite being set in dream spaces.
The cast is excellent which is good because a lot of the supporting roles are underdeveloped and would be forgettable if the actors didn't own the roles as they do. Only two of the main characters can be said to be truly well developed - the rest are simply glorified catalysts. Perhaps that's by design.
The protagonist Dom Cobb provides an emotional and dramatic center to what would otherwise be just a thinking man's action movie. We also get a glimpse into the psyche of Robert Fischer, the victim of the mind crime. To say much more about the plot or characters would be a disservice to those who haven't seem the film yet.
If you still haven't, I highly, highly recommend it. But like all Nolan's films, the more you pay attention, the more you'll get out of it. It's not passive entertainment. I demands a thinking audience. I generally have to see his movies twice to get the most out of them and Inception is a prime example of that.
If you are a fan of Nolan's other films you will undoubtedly enjoy this one. As some have pointed out, it is the logical culmination of everything he's done until this point. If you simply like movies that challenge you to think, Inception will promote some serious thought. It will confuse you in a good way. If, on the other hand, you are looking for simple popcorn escapism, then you should probably go see the A-Team or Knight and Day, because Inception will mess with your mind just as it does with its characters.
When I get some more time, I'm going to do a more in-depth spoiler-filled post in which I will discuss some of the theories that I've been thinking about as well as a discussion of the various elements at play in the film.
This will really mess with your head.