I just got back a little bit ago from seeing this with my INFP and ISTP. Happy to report that I had no trouble understanding what was going on, but I don't tend to have much trouble in that department

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I really enjoyed it. The casting was pretty superb. I'd agree in not understanding why Ellen Page was cast, but I could see her appeal to the role. Being next to such intense and developed talent made her seem like even more of a youngling though.
Arthur (Levitt) was my favorite character. I wasn't contemplating mbti at the time, but it figures I was drawn to the ISTJ. Attractive bastards, curse you!

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Spoilerish Funtimes!
It was a perk to have them nip the predictable plot line in the bud toward the end.
For a while, I was halfway under the impression that Cobb (DiCaprio) would've been in a dream state throughout the entire movie. The other half was feeling that to be far too predictable, even if they fed it for a while. I was happy with how it panned out. It was slightly less convoluted, but it was also less predictable. Even in the little fact of Cobb not staying for his wife.
There were no problems with the dreams not being dreamlike, imo. The purpose of them was to appear to be reality and, also, to not draw additional attention from the projections.
The only area that could have been more dreamlike was Limbo, but they weren't children with crayons. They were an adult couple, who likely wanted some semblance of the reality they had known. Of course, a lot of people (and damned well myself, at any age) would have gone wild with imagination in that scenario.
They still showed what they were able to do with the dreams by creating entire cities, with intricate details. Then they would toy with those details to make you aware of there being few limitations. It wasn't in your face in that way, which I found oddly refreshing.
I'm all about the extreme bouts of fantasy, but I can just go to Burton films for that if i so desire it
