I heard a lot of good things but I was one of the few who didn't care much for it.
The things I remember most:
1) The whole thing with TKs felt kind of sudden. Mentioned once or twice and then very important. Maybe I just missed all the cues. Or maybe it just felt out of place in a world where I already had to take time travel seriously despite its seeming plotholes (see item 3)
2) That kid looking angry and evil was a little too silly for me, took me out of the moment.
3) It made for a cool visual but at some point, changing the past changes the future in more than just minor ways. For example, I seem to recall Paul Dano being tortured or something and as he's walking, he's disfigured and maybe loses his feet or something? There's no way you'd be in the exact situation you're in with no feet. Not even the same line of work. So that took me out of things a bit too, but not too badly.
4) Thought the best part was JGL meeting Bruce Willis but sadly they shared like one scene.
5) I did not like the doofus henchman who went full evil at the end.
I guess I remembered more than I thought!