The framing device here places this in a very specific thematic context: That even in these carefree times, you should make the effort to appreciate and honor your forefathers whose heroism and sacrifice during wartime made your life possible. Fair enough, but Tsui Hark comes close to subverting this theme by making this gleefully entertaining and exciting, World War II era combat shot with bullet time and geysers of CGI blood. The bad guys are larger than life too, starting with the main antagonist - Lord Hawk, a supervillain who's pretty much Oswald Cobblepot reimagined as a Chinese warlord.
And just when you think it's all over, Tsui throws in a totally imaginary bonus action scene as a capper, and it's one of the best in the entire movie. I really wish I could have gotten to see this theatrically and in 3D.