I'm a big fan of the manwha and i know what will happen in the next few episodes so i assure you that it is gonna be Epic. You have to give every tv show a chance to start the story and build the world if you gonna judge by the first few episodes and stop watching the show you would miss a lot of top tier shows.
Now about the Adaptation. as a manwha reader i loved it till now (episode 2). the voices are perfect for the characters.the art style is similar to manwha and it is knida unique it suits the world of TOG but it could be better.***another note the studio is using the same art as the manwha. the manwha was released in the 2010 and it didn't have good art style quality but the studio is trying to respect the manwha so all i can say it is going to be a lot better when the first arc is finished because the manwha improve a lot in the quality so just a little patience here***
The Ost and the opening and the ending were all satisfying. the only thing that concerns me is the pacing of the story till now (episode 2) they cut out some things in the anime so i hope they do not rush it overall i'm more than satisfied and if they do things right this anime will be one of the bests.
Edit: I am on episode 6 and i can say the studio is doing a really good job on the adaptation so now i can recommend this to everyone. watch it you wont be disappointed.
