Easily one of the most underrated JRPGs in terms of gameplay and writing. It’s a shame that it’s mostly only known amongst Megami Tensei fans because it truly deserves to be regarded amongst games like FFVII and Chrono Trigger as a must play for JRPG fans. This game has IMO the most realistically portrayed characters and most nuanced and engaging branching story paths in the MegaTen franchise. I would go as far as to call it one of the best JRPGs of all time in this regard. This is one of the only JRPGs to make me actively agonize over the choices I was making and really contemplate their effects on a personal level. This complexity and realism of character choice is something JRPGs don’t often attempt or execute well. Devil Survivor pulls it off almost perfectly.
The gameplay isn’t quite as strong as the writing but is still fantastic. It’s challenging, complex, and very fun to master.
As an aside, I understand the art style turning people off and making them think it's going to be some vapid anime harem game, but it’s truly not. Everyone who likes JRPGs should give this game a try. Its absolutely fantastic.
N.B. - Overclocked, due to it being a 3DS game is unfortunately not nearly as accessible as vanilla Devil Survivor. While overclocked stands as the definitive version of the game, imo, by adding content that enhances the game, the vanilla version is still fantastic and worthy of being played if you can’t get your hands on overclocked. Everything good about overclocked still applies there.