I know this is an old thread, but here i go:
It is hard to say because i see a very significant split in the style SIU tells his story between the story until the workshop battle and afterwards.
There are different think i like or dislike about those two parts each. So, i will not include things i liked in the first part which are not done in the second part anymore.
Since it seems like the style of the beginning of ToG won't come back, i will focus on the time after the workshop, including the workshop.
What I like is that SIU kind of deconstructs the 'hidden power hero' trope.
Baam has one of the biggest potentials if not the biggest potential in the tower, but he still keeps on screwing up and would not really get anywhere without his friends. Many people find that frustrating, but i like it. He is given a great gift, but, mentally, he still has to earn it the hard way.
It is never presented at the easy choice to keep on being morally 'good' like Baam is.
In a lot of manga, i feel like the choice is a lie: There is some evil guy everyone obeys and then you punch him because you trained enough, end of the story, everything is fine because you 'stood up to him'.
Baam constantly tries to stand up against things he does not deem right, but there are things he cannot change, no matter how powerful he is. Without Koon to do the cunning for him, he would be in deep trouble.
So, yeah, in most manga i kinda hate the maincharacter due to his accomplishments always feeling constructed, but i like Baam.
(I have to admit tho that this is also true in the first aprt of ToG)
I also have to generally say that SIU is a very imaginative guy. The worldbuilding is great. And we didnt even touch a lot of the world. As far as i know, ToG is part of a bigger universe called Taize Ulzer stories (if SIU didnt change that after the popularity ToG got, that is^^), and i really would dig many more stories being told about tha tuniverse (with the exis and all).
His imagination is sometimes a double edged sword: For example, oftentimes, the rules in the games are not really that important for what will happen in the game (when it ends up being a one on one fight anyway) but kind of complicated.
But when he gets it right and the rules really have an effect on what happens, he is at the top of his game and i love it.
Much like oda has an 'not just an island' approach when he thinks of a new place, SIU puts effort in any new areal he draws, even if it is just a place the group stays without a lot of importance. That's serious effort.