Really just comes down to bad writing. A bad idea written by a good writer people will enjoy the film. A good idea made by a bad writer will be bad.Its not the premise thats bad it could have been a lot of campy fun, its just everything else: the CGI the plot the acting the camera framing the editing, its all awful & not in any kind of studied intentional awful that you get from some other stuff.
Anyone with vague interest in that meme of a movie: just watch the Pitch Meeting, its vastly more entertaining than the actual thing.