I disliked the first 7 episodes, however the 8th and the 9th were alright but they were still mainly fillery.
Picking up from the end of Season 2, the Silver was NOT supposed to be destroyed and the Reijo Maigo is NOT taken out of Yuji in the Novel. Infact, during the battle with Sabrac I believe that Yuji merges with SnH after accepting his ideals and how SnH wants to make a world where Flame Hazes, Tomogara, and pretty much everyone can live in peace. If a mistake is made when trying to create this world there'll be dire consequences so the other Guze No Tomogara seal him away for having a dangerous ideology in the first place.
They made a relatively large change in the storyline as Yuji should've went SnH but he didn't so I wonder what's going to happen.