Inception was a great movie and under normal circumstances you should go see this movie in theaters and if you have the opportunity, view it in IMAX especially.
The movie is slow starting but this movie needs that kind of start to slowly immerse the viewer into the world that these characters live in. Extractors go into people dreams in order to learn their secrets and though it sounds confusing, the painful beginning actually describes the full process in how it works. The main job in this movie isn't to extract information but rather to incept information into a person which is apparently a lot harder than stealing it. Nolan goes to the extent of creating multiple settings and storylines to keep the story interesting and in the end leaves the viewer wanting more.
It's no Batman but after the slew of failures we've seen this summer, movie goers will take anything that doesn't have a cliffhanger ending that will ultimately result in a money sequel, or anything that has to do with vampires.