A lake that big (connected to Devils) is no honey hole. I fished there plenty of time and the fish, especially walleye and pike are plenty. That being said, every lake is someone sweet spot, doesn’t mean that it their private lake.
Also, I like to think that average Joe from MN are not going to venture all the way to Devils just for more than a trip or so a year. Fishing is good but not always great and a lake that big, can always throw you a curve ball.
Best thing for forum like these are to give accurate information to not mislead people to the wrong area but also to keep them safe. Also, from my knowledge, Devils Lake city area is thriving bc of fisherman and women who comes from other area. If it wasn’t for the great fishing, it will just be another small town in the Midwest.