In my smaller community in Chico it's a nice thing. Mostly bike thefts, and "what was that noise!?!?", but it's also a great way for people to communicate needs like moving boxes, and free fruit from backyard trees. If you are the type that enjoys being a part of your community it's a plus. If you don't like being bothered just turn off the notifications.
I guess I'm saying, I prefer having a finger on what the people are doing around me. Without it my annual block parties wouldn't be nearly as fun either.
Can it involve bickering and nonsense? Absolutely, but what doesn't these days?
ETA: It is absolutely fantastic for lost pets should that be a concern of yours.