After being disappointed by the Last Airbender, this movie was definitely a blast. I have to say the director is a mad genius and the story is fantastic and very innovative. Some say it is somewhat like the Matrix, believe me, Inception is so much more complicated and deeper than the Matrix. If I were the director, I would be offended if someone compares it to the Matrix.
Also, honestly the only reason I think some people might not like it is because they did not understand the movie. And also, please don't bring your 5 year old to the movie. They would be asking "what is going on" the whole time.