I wrote a very long tedious review about how good this manhwa is, and how it will improve over time. Sadly, that does not seem like it will happen.
People argue that season 2 is where things started declining. To be more precise, I think the first 40-50 chapters of the season 2 is super solid, in some ways better than season 1. The art is better and establishing a sense of mystery and foreboding was also quite well done.
That is... until the workshop battle. That's where things REALLY went downhill. It feels like the author transformed into a totally different person.
Possible reasons for the declining quality?
(1) author's habitual wrist problem, which apparently still needs surgery or some effective long-term treatment --> affects the coloring, art, and how many quality panels you can dedicate
(2) overall health --> less creative, less logical flows, bad dialogues, tendency to draw things out, etc. Being a comic writer is tough on one's health.
(3) stopped giving a damn --> hey it's a problem that many artists face. It's possible the author just stopped giving a damn.
Here are my tips to the author:
(1) take a long ass hiatus: no one gives a shit about this manhwa at this point
(2) work on improving health: meditation, proper sketching posture, exercise, diet, etc.
(3) improve on art, especially action scenes
(4) announce to publishers that the last 120 chapters was all part of a lame joke - a demonstration of what poor story writing is all about
(5) start a whole new workshop battle and actually make it good and logical OR take the story in a whole different route.
The most appealing aspect of tower of god is its world building. But it suffers in its execution and details. The first season was very good at the execution and details, and combining that in conjunction with a dedicated wiki page gave the series a sense of balance and mystery. I've been reading Tokyo Ghoul and I'm amazed by the level of sophisticated dialogues and plot building. But it still manages to establish that sense of macro-level big scale that leaves people wanting more.