I watched the movie only once and definitely need to watch it a second time to understand a little better.
I was very intrigued throughout and Christopher Nolan proved once again just how creative and talented he is. The concept isnt of time travel but things and people moving through time that is indeed linear, i think that is how the idea for this movie started and then it was expanded out. Which i found intriguing, very thought provoking and creative. Something new and fresh that i can appreciate. The visuals are absolutely beautiful and the acting is incredible, lots of different and unique characters in one movie that click together perfectly despite the extreme differences.
There are MANY plot holes that i don't understand. And that is why the movie has a 3/5 from me. The plots holes maybe are supposed to just be red herrings but, then just skip all the red herrings and and make the movie a half hour shorter. That is simply my opinion though.
I think it is worth watching, worth thinking about. It will at least make you think of time a little differently.