Review of this series: Tbh, I really enjoyed this series. First of all, the most obvious W is the art, not only is it really detailed it also generally just looks really beautiful, especially the character designs and the lighting & shading. The movements are really fluid and well done too. The characters, are done really well done too, in my opinion. Apart from the MC who is quite generic (but I've seen far far worse, so no complaints). Beelzebub is very well done, the 2 characters that are introduced later in the series are both very interesting too and not generic at all (especially for these kindof series).
Childhood-friend is 10/10 btw.

Then about the general world building i don't really have anything to complain about, it has a level and skill system and some of the skills and the monsters are actually pretty interesting (I've seen far worse as well basically, but it's not bad).

Story: Been a while since I read this series tbh, so I skimmed through a few chapters and it's pretty doable I'd say, especially the little arc between ch. 14-17 is very well done.

My review is this high btw, because I value art very highly, and for some reason I'm weirdly drawn to "got kicked out of party series", I've pretty much read nearly all of em, and this is the best I've found, I think.
And as I said; just really enjoyed it.