I liked the first season much better, but still I expect a lot from the second part of the second season.
Keep in mind that the first season encompasses 3 arcs and 9 volumes of the light novel.
The second season is adapting a single arc and 6 volumes of the light novel. Though the 4th arc of the series is indeed the longest to date.
The reason this might make people like the first season more is because there is more ups and downs (since you have 3 entire arcs being told over 24 episodes).
This might lead to the 4th arc (and the second season) feeling a bit slow compared to the first season. But, as someone who has knowledge of what happens in the 4th arc, I promise you the second part of season 2 will 100% be worth the watch.