The truth is nostalgic, they recreated that ending well with another animation studio.
The negative: Megumin.
I don't like her personality and the exaggeration with her "explosion" to the point of being annoying.
I even wish they would do a Darkness spin-off than this.
Megumin pretends something that she is not and Yunyun the opposite, even though Megumin in the most serious moments shows that she has a good heart and thinks of others, most of her other self tires me for being a crimson demon like all the crazy people in that town , but for me the true crimson demon is Arue.
I really do not see it as "useless" to use the explosion spell but it is not very useful knowing that you use it once a day and it only works for critical moments.
The positive of all this: Cecily the best crazy priestess xD
Hopefully he will appear more on the scene for the following seasons.
In conclusion: I did not feel much that this was KonoSuba like season 1 and 2, some forced jokes and less interesting, Megumin is funnier when she is with the group Kazuma, Aqua and Darkness than she is alone.
But in the end I liked that certain characters like Arue, Cecily, Yunyun and Komekko have their scene moments that were interesting in the drama, I played their mobile game, I loved that they developed those characters.