Very good film. There's very little dialogue which seems to be much more effective in conveying how the characters were feeling, and also allows the story to be told visually. It also means that Tom Hardy isn't able to chew up every seen he's in and instead give a very good, understated performance like the rest of the cast. The mixing up of the chronology was a bit confusing at first but soon got used to it. Could have done with a bit of CGI to show more troops on the beach; Nolan doesn't like CGI and therefore wasn't able to convey just how many people were stuck there
Also, the Churchill bit at the end was a bit cheesy and probably could have just finished with the drinking the beer (but then I think Churchill was a nobhead, so that's just a personal thing). Films like this though make me realise just how lucky were are to not be conscripted and have to go through such awful things. A lot of my family were in the forces, from the trenches at the Somme to the Cypriot civil war, and war films make me think of them and what they endured. There's always a risk with such films as this that they become jingoistic, flag-waving, chest-thumping cheese-fests but Nolan absolutely pulled it off.
I will have to go see it again though in a normal cinema; my mate booked us in at the IMAX and then messed up the booking by putting us all in the third row from the front (he got confused by the map as to which end the screen was at). Watching it from so close up was brain-frying and nauseating. A few of our group complained afterwards that they felt sick and were blaming the curry we had eaten before, but it was definitely the screen; why they hell do they bother putting rows of seats so close to an IMAX screen?!