I think GODZILLA X MEGAGUIRUS could have benefited immensely from emphasizing the latent horror elements in the Meganulon, Meganulas and Megaguirus.
The designs themselves lent themselves to this kind of use and execution. With these creatures from the past terrorizing Tokyo, the only thing needed to make the horror complete would be a vicious, evil, bent-on-destruction Godzilla. The Gira-Goji design, with some tweaking around the eyes, and the right direction, could have helped to place a sense of real peril into the story.
I would like to have seen the Meganulon, Meganula and finally, Megaguirus engaged in constant, ongoing attacks. My GXM would be very graphic.
That the horror and destruction of creatures from the past was the direct result of a futuristic weapon, designed and deployed to destroy Godzilla, would be most ironic. A element of the story could have been devoted to the political consequences of the use of the Dimension Tide. I mean, someone would have to be held responsible, which means that someone would have to be 'sacrificed.' If written well and with some imagination, the intrigue and suspense of this part of the story could have been interesting. People in power will often do anything (to anyone) to stay in power (and avoid prosecution). This could have mirrored the viciousness of the attacks by the Meganulon, Meganula and, finally, Megaguirus.
And then, Godzilla reappears. Anti-hero or the Finisher? Maybe, GXM, like this, doesn't have a happy ending.
â€œGodzilla is a force. He is not something that can be stopped by human weapons. He is brutal and severe. My Godzilla will be the cruelest and fiercest in the history of the series.â€