The beginning of the novel was enjoyable when it was about the MC starts showing off his talent and, and was constantly being oppress by the CN corporations.

Later on, ignoring the gary sue with perfect memory of everything aspect, quality of novel content starts to drop as it starts to get filled with a lot of fluff, and cheating/NTR when they reach the world contest arc. Even the author admits the quality of the novel has drop at the end of the novel.

The cheating/NTR would have been fine if it adds a lot of entertaining drama/conflict to the series, but it doesn't with the girlfriend being completely oblivious (whether or not it is on purpose). He keeps telling himself he wants to be a good man and makes up reasons to justify his action.