Currently Airing Anime

DxD episode 2 was great

 Spoiler

I don't think this is a bad adaption, and the author himself is helping them rewrite it to make it flow better for an anime format but a lot of my favourite scenes were altered or changed and that makes me a bit sad.
Koneko getting angry/frustrated with Issei.
The castle souvenir
The mountain training and the results of it(Issei didn't change at all, in the novels he supposedly became noticeably more buff afterwards)
And some other smaller things.

But again, i think it's a fine adaption and the story is still the same and flows just as well and it's not because anything is really being left out that harms the story or characters.
Just some of the small things that are lost in the text->animation format i guess

Atleast Ravel appeared in all her greatness. Toooo cute.

As pure and innocent as driven snow!

 Spoiler

Best girl right here.