Since it is looking like the Taisen films are going to become a yearly thing, I feel this would be the best time to write something like this. These movies overall are infamous in the tokusatsu fandom. Anyway, here go my thoughts on the Super Hero Taisen films I've seen so far.
Super Hero Taisen:
Superhero Taisen Z:
Kamen Rider Taisen:
The Showa Riders are written so far out of character in this film that its not even funny (I'll go more into detail in a bit). Now, the whole fight to the death concept is once again a ruse to bring the riders together which doesn't make much sense because all the riders know who everyone else is and where they are. The movie expects us to believe that a fight to the death was the smartest option to bring them all together as opposed to you know, calling every rider up and bringing them together in one place without trying to kill each other. To top it all off, the Showa Riders reveal that they were indeed serious when they mentioned their dislike for the Heisei Riders. Their entire reason for fighting the Heisei riders is because "They're too human" and that they care too much about their dead friends and family. The entire point of most of the Showa riders is that they are fighting because they are still human despite what happened to them and that they're fighting so it doesn't happen to anyone else. The Showa riders' reasoning makes even less sense given that it was V3 and Black of all people that told them that. This movie feels like the writer effectively back-handed the entire Showa Era. The only scene I liked in the entire movie is when X slugs Takumi for even considering listening to Kusaka's ghost.
Final thoughts: These films are nothing more than fan service targeted toward those fans who focus on who can beat up who. The annoying part about is that these movies are using the AU setting as the only reason for why these movies are possible. Yes, an AU setting is an alright way to experiment with existing characters but its being used in these movies to make the heroes not think and as a result, they aren't acting like heroes. When I watch movies like this, I expect to see heroes acting like heroes and not fighting amongst themselves for ridiculous reasons while the world is in danger. The greater threat should take priority. At some point, someone at Toei needs to step in and tell Yonemura and Shirakura what they can and can't do with these characters. They are effectively insulting both the legacies of the characters involved and the people who produced the shows. However, that probably won't happen because these movies practically print money for Toei.