Okay, so I usually don't write or rate any anime that I haven't finished yet, just because I feel it is unfair and I wouldn't have done it here either, but seeing the score while there is only one review out, I felt that it is necessary to give people a better understanding. Because I am not really able to rate a lot of the aspects of the show yet, I decided to not do a usual breakdown of the different categories, but I would just write a short text about why I think people might dislike it and why I think it is stillat least worth the watch.

So let's begin with why I believe people might dislike the show. Gekidol is one of the shows that tries to trick you on the surface level about what it wants to be. For example, the title alone is a combination for the words theater and Idol and together with specific scenes in the first few episodes, the general idea that this is just an idol show in a theater is very reasonable. However, the show also shows a lot of hints that already reveal in the first episode that this is not the case and I believe this is a huge risk. Because people who expect an idol show will notice for example the strange atmosphere that is different from your usual happy idol show while people not expecting anything just assume this is about idols and leave. This can obviously work, one of the prime examples is Madoka Magicka, but even that show only blew up after everyone understood what it was really about and therefore started recommending it to people outside the Magical Girl fandom (note here: this is not to say that this show is on the same level, it is just a comparison).

Now with that out of the way, what is the show about? I can't tell you 100% yet and I also can't tell you if the ideas presented in the first 5 episodes will be executed properly in the end. What I can tell you is that the show has a dark undertone which mostly comes from its subgenre SciFi. For example, there is a phenomenom where parts of the city just vanished and no one can explain why. At the same time, the world has technology that makes watching a theater a lot more enjoyable and which seems to have a hidden spec to it that is not yet revealed, since it is mainly owned by a large company. Add to all of that an android who seems to be able to act out (because it's a show about acting) the people the person loves the most and make you believe you are in the presence of this exact person again. This android again is owned by the same company and may or may not have developed feelings (again hard to tell yet, because main part of the show is acting).
To summarize that: The story and world has a large mystery to it that could potentially evolve into some amazing climax in the later episode. Furthermore the combination of a happy surface level anime combined with this dark undertone makes it really exciting to watch, especially since some of the characters also show a more "darker" side to the whole idol job which is usually not mentioned very much. I can only tell you to try out the anime, because I feel a lot of people got the wrong impression from the first few episodes (even though the hints are already there).

Edit after watching the full show: The show is definitely not something for everyone, but I still think the score is generally lower than you would expect. It is to say however that it requires you to actually think about what is said and also what you see. There is context in every dialogue and scene that makes it a very interesting experience. It is an interesting anime from a directional perspective to say the least. And I would say that it has a satisfying ending at least the one that I got out of it. Because at the end of the day, the anime is not easy to understand and this doesn't just come from the good parts about the directing, but also some bad parts. A slight spoiler, but I already said that this show has SciFi elements, but there are different timelines that are shown, but it is not always made clear if and when you are in a different timeline and where this is set in reference to the main plot (or the main timeline) which makes it hard to understand sometimes. I think this could have been done better. But I also say that it is quite enjoyable if you have fun with different approaches to directing and you are willing to try and understand what the anime wants to say.