Some poeple may say that everything was predictable, I would say yes after watching few minutes and couples of scenes you may be able to proedict the ending, but still, you know only his goal you don't know how he is gonna achieve it.
As a personal opinion I believe that this movie is brilliant, time traveling isn't a new thing but the combining comedy a little bit of romance and good storylines makes this movie great, I did enjoy every second watching it, however I'm not a big fan of comedy movies, but tbh Adam Devine did a great job, the movie is awesome it delivers a great idea.
Try it you wont regret.