Can you go into detail about what is great about it.
It feels as if your comment is written in sarcasm, but no matter. I guess I would say the first part is the story(excluding the latter part of the story which is lackluster most likely because of author "problems"), as I said already the story is influenced by LiL, but it takes(especially after the few beginning updates) its own way of telling the story. The dream and train sequences are novel and very innovative way of telling someone else inner workings and troubles in a creative way, but the dream sequences of the story also remind me of one particular french author works that I used to read 12 years ago, so it is a bit of personal favorite of mine. UI while it is not a praiseworthy, all things are learned by comparing one to another, so compared to LiL, SO is much better in terms of UI and the "diary" system is something that more story and established main character driven VNs should have(it is also a bit of a reminder of "Updated My Journal" stuff from planescape), unfortunately the diary system is not well expanded, most likely because Personas simply had no time to expand and enlarge diary system. The characters were also well developing(and I must that they are well developed and in process of developing and not well established, it would take another year of updates for characters to be well established, some character like the weed girl is even abandoned, so there were still a lot of work needed for the story). Overall story is also good, the were very promising plotlines and several possible lines of development for characters, meaning that even in its early stages the story and characters had enough foundation that you can somewhat be sentimental towards them and not consider them as "one character trait only" kind of garbage that is popular in current VN media. The design and overall character models are also good, not on par with LiL, but good enough(excluding the latter changes that were done by the time Personas was going straight to dropping soap in the shower action, so the game itself took a big hit because of it). The music is not good, not terrible. It fits the respective scenes that it is places in, so no praise or criticism there. The most great thing about it is perhaps the fact that MC is clearly a "window" if you will, towards Personas soul if like to call it. Many good literature are heavily influenced by their author, because the writer put their soul into writing and you can almost always figure out a good literature from a bad one. It is the "unique" sense of originality and creativeness that sets apart the work that is done out of inspiration and dedication, from the works that are out of greed and attempt to make money. In this case SO was a clear work of personal inspiration and dedication and it shows, so there is that as well. His recent criminal actions were a bit predictable for me at least, because of SO being a "window". Some parts of the story shows a desperation of MC trying to convince himself that he is not a monster and actually a good person, that desperation is very genuine in the game, so genuine in fact, that I already suspected Personas had some issues or troubles, I did not suspect the extent of his issues, but it is fascinating thanks to that clear case of a person projecting himself into his work. This part is one of the main reasons to play SO in its current state to be honest, to better understand and research a mans attempt to convey his feelings and visions through a story, the news of his actions makes exploring the game even more fascinating. The second main reason is the potential of this game. Sensei Overnight has untapped amount of potential and list of possibilities that can be finished to its logical course, if done so, it could be a very good VN rivalling many other Japanese and western(few as they are) VN. That is a bit of a short summary on why I think it is "great", but to be honest I rather consider this game as a potentially visionary work, that unfortunately died far too soon. In a way I could refer to my profile picture. SO is what manga "Freesia" is:
Fresh and original work that will leave its place in your mind, the visionary work that stand out upon thousand and thousand of shitty and worthless caricature that is considered as "literature" by some, an example on how the work of actual vision and idea for literature work should look like. That is what Freesia in terms of manga and SO in terms western VN is. Freesia at least had the ability to reach the height of its potential and become a masterpiece, Sensei Overnight was robbed of such possibility by the inability of its own author to be a decent person