It's hard to explain but parts of the movie felt legitimately "haha this is stupid because this could have been a 80s movie", like the idea of Adolf Hitler being a Kung Fu master, and the protagonist having to travel back in time to stop him. That is so dumb, but also something I could totally see a movie about. But then they throw in him going too far back in time, and it gets to that "trying a bit too hard" IMO.