At this point, Detective Conan movies are formulaic...in a good way. They utilize the massive, diverse cast in the franchise and build the movie off character interactions/relationships and over-the-top action sequences. M28 is no exception. The movie builds off of the Nagano trio and Conan's dynamics quite well, as it manages to fill the theater with laughter, with grief, and with drama. In addition, this movie, at its core, is a police drama, which has always been a superior setting for Conan movies outside of the Black Organization movies. Outside of a few weird cuts and usual Detective Boys fillers that should be removed from themovies permanently (which they can't, I understand), the movie remains mostly consistent in tone. The case is presented in a logical, engaging manner. The only cons of the movie are an underwhelming villain and the ridiculous action sequence at the end, but neither detracts from the movie all that much.
While the movie doesn't quite reach the heights of M26 or the older classics, it's still an enjoyable time at the theaters for long-time Conan fans. A well-deserved box office draw. I think it is very impressive that the movies have been consistently above average to great since M25, and I will continue to watch these movies in theaters until they stop making them.