I went it with very low expectations so the fact that it exceed my expectations is not shocking.
I wasnt so bothered with the fact that the cast would be changed because i have always been a fan of Lee Joon gi, also i fell in love with Arthdal Chronicles because the story was very riveting.
The cast change was awkward initially but i think everyone found their footing
LJG was able to capture a warrior Eunseom perfectly but i think he had trouble being Saya and i believe it was because he tried to be SJK's Saya. He tried to be a saya that was similar to season 1 im guessing so people can relate but that is not LJG. He did a good job potraying Saya as someone looking for where to fit in.
The actress who played Tanya did a really great job, i was honestly wowed. She played the part of the high priest very well in my opinion, i say her as a leader.
Tagon and Tealha were beyond perfection, i was wowed.
Between episodes 5&8, i almost gave up watching but im glad i didnt, because the cast really shined from episodes 10-12
Keep an open mind when you watch it and enjoy the story of arthdal.