watch this if you don't mind a fairly average storyline, and are just here for the harem or to watch fillers.
Me personally, I don't think it's too bad, the start was terrible, which I agree with - all the missing context, character background info and the Norse mythology terms. But as you watch on, you slowly start piecing information together and get a undertsanding of the Mc's background. Overall, it started bad and kinda got better, I really liked the ending as it didn't end on a cliff hanger, and it was a happy ending.
I'm not arguing that it is a good anime, I personally enjoyed it because I enjoy Isekai genres so i may be a bit biased and so I understand that not everyone enjoys these kind of series as much as others.