I wouldn't say it's "Enthralling from start to finish" as the poster claims, as at some point when you don't really know yet what's going on, the movie gets so slow I almost turned it off, generally I really liked it.
Time travel is always tricky in movies, especially if treated seriously. I can't get into too much detail here as discovering what exactly is going on is a huge part of the fun here, but the movie delivers. The pace is slow and uneven, action is limited but even if you like I did, guess the big plot twist(s) early on, it is still fun. I can't say a bad word about acting though, I think everybody did a great job.
It's based on Robert A Heinlein's story "All You Zombies" but I really wouldn't be surprised if it was based on something by Philip K. Dick. If you're into Dick ( :P ), you'll enjoy this.
I also saw The Interview and I'll have to say I find most of what critics say funny. Come on, it's a movie from the guys that did such groundbreaking and important masterpieces like "Pineapple Express" (which I loved) and "this is the end" (which wasn't bad), what did you expect ?
Well, I was expecting something of a bit higher quality to be honest. I knew it's a movie about putting things up your ass, not an insightful social commentary, still I was hoping it would be funnier. Generally a mediocre "stoner comedy".