Well, I just got back from my 2nd IMAX viewing, and I have to say, the movie worked a lot better for me this time around. While the moments of cheesy dialogue still bug, the big thing that was different for me is that the 3rd act worked with the 1st one a lot better on re-watch, so the movie felt more cohesive to me. Once I knew how the 3rd act would go, I got a lot more of the little clues and tidbits of information in Act 1 that were laying the ground work for Act 3 which on first watch just sounded like a bunch of movie-science talk. For example, [blackout]on first watch, I hadn't realized that the "station" that hosted NASA's hidden base was actually the future "Cooper Station," and that part of the reason they needed to solve the equation to "harness gravity" was to get that huge thing operational in space.[/blackout] That might have been obvious for some the first time around since Michael Caine pretty much said it outright, but we get so much exposition thrown around in Act 1 that I hadn't made that particular connection at the end, so it was a lot more rewarding for me this time. There are other little details I picked up on in this viewing that helped it all make sense to me more this go-round, which certainly makes for an all-around more satisfying journey.
I highly recommend to anyone else who felt unsure about it after their first viewing and thought the 3rd act might have damn near ruined it to give it another go. I now feel quite comfortable rating it - I'd say 8.5/10. Also, whereas after the first viewing, I would have ranked it somewhere in the bottom half of Nolan's filmography, I now rank it only behind The Prestige and The Dark Knight on my list of Nolan favorites. Great movie.