REVIEW WITH NO SPOILERS
The first season of Overlord showed me a premise cliché, with some new elements that had potential to become something totally different from animes with a similar premise.
This season confirmed something that I realized watching the middle of the first season: This anime will not reach you expectations John.
The focus on secondary stories is really problematic, because this stories are boring, forgetable and REALLY predictable.
I really don't think that I liked one of the new characthers of this season.
The animation is regular, but becomes really bad in the last 4 episodes. So, it becomes irregular.
Well if you liked the first season you'll like this one. Nothing really new here (actually, nothing really INTERESTING and NEW). That's it!
Oh, and if there will be a third season, I'll watch as well.