Why do people like this film?

Rating: 6/10 (27 December 2015)

Why do people like this film? It's a romantic comedy without a plot. The story-line is simple. Man decides to find a girlfriend, finds one, they marry, have three children, father of the man dies. End of movie. Of course that is not enough to fill a movie, so the director added a twist. The father of the man told him, when he turned 21, that the men of the family are able to travel back in time. All they have to do is to step in a dark secluded space, think of the memory they want to go back to and clench their fist, and voilà! Nice idea to fill the rest of the movie. Unfortunately their are so many flaws in the story, it got annoying to me. It's a nice idea to travel back a few minutes, maybe a day, to redo something that could have been better, but sometimes the steps are major, and at some point the man finds out that his first child is now a son instead of daughter. His father explains him he can't go back before the conception because if he changes the past just a tiny bit, out comes a different child. Nevertheless, unexplained is how he manages to get his daughter back. Another thing, he can travel back in time, but not forward. So he has to relive his live with his changed past. If this is only a few minutes it is quite all right, and there is a funny scene in the movie where there has been taken advantage of that. But to prevent that the movie will get boring by showing the reliving, the director just skips to the present again. So it looks like he travels forward in time as well, but he doesn't. You have to realize that for the major flaw in the end of the movie. The man travels back to the moment his father is still alive, and the father decides to have a father-son moment so he travels some 20 years further back with his son to skip pebbles on the sea. (That is before the moment of conception of his three children!) So now the son, a little boy, has to relive his entire life, remembering all the changes he made to his past to get where he was some 20 years later. But the father will only tell him that he can travel in time when he will be 21. So by then he will probably have forgotten all his changes... However, the end of the movie shows he still managed to redo them all.
This simple romantic comedy has no plot, the time-traveling part is infested with flaws. So, why do people like this film?