I was keen to see this film given the high IMDb rating, as I agree with nearly all ratings I've seen on the site, but I appear to be one of the minority who think it is overrated. I couldn't emotionally engage with the characters for some reason, and so was not too concerned on the outcome for them.

Whilst there were some complexities to the plot, it is reasonably easy to understand. I agree with some other comments I've seen that many characters accepted the quite fantastical premise very readily, and were prepared to place themselves at considerable risk for no real reason. So some reactions were not what you would expect for the situation.

Having had time to reflect I would watch the film again, but do not think I will keep coming back to this unlike the Matrix which has a similar feel but is a much better film.