In all honesty, Overlord II was disappointing. The first season wasn't that bad, I like having a more evil roll for a protagonist, and having less of a generic underdog character. Having said that, this season did not live up to the hype. The story branches out to many side character and while I usually enjoy something like this, you don't really grow attached to anyone and none of the fight scenes carried any weight as a result.
The animation overall wasn't that bad, the 2D scenes seemed pretty standard but oh god, the 3D was so bad. Copy pasted soldiers, poorly rendered monsters, etc. I don't think all 3D in anime is bad but it doesn't blend well at all here and really breaks your immersion.