Xshamee
It is good but I think what made the community start a frenzy is because Ainz agreed to be someone's servant even though he would rather be their ally than a servant, but that's the only thing I can think of that would piss of everyone, other than that, just by making Ainz roast the grilled chicken Riser, you already made our day, because nobody likes that little shit. But to remedy, the problem of Ainz accepting to be someone's servant, it's best if you write reasons other than just collecting information, for example when Rias told him he will become a devil by becoming a servant, this might pique his curiosity as he might gain racial levels as a devil, and some other reasons. Other than that, the story is great, so keep up the great work!
I'm not saying to not continue this fic, after all I follow the other one aswell but you really should not let this one down, at least continue it after you concluded 'Conquering the King of Kni*cough* *cough*' There are not a lot of Dxd Ă Over lord but they have a lot of potential as the magic and powerlevels are quite 'interactive'. E.g. Ressurection, it is only possible with the sephiroth grail in DxD, while in Overlord [Raise Dead] a mere 5th-Tier spell is and True Ressurection 8Th/9Th-Tier complete Res. is without drawbacks and the remains are not even necessary and time is at max. 1-2 sec. In addition, if you plan to make Ainz (After conquering the NW) you have to make him stronger because he must have come across WM items which increases his own level past Level-cap (confirmed by author). And Momonga can be baisically brought over like this without adding much and he should still be able to put up a fight against Super-devils. (Staff and Throne)