I have not been to sonic much, but there is one by me and I think that is only place I have been.
They don't mess up shakes but every time I have ordered food it's been meh. First time I ordered cheese sticks and all the cheese was gone inside them cause they were cooked too long ... I don't remember what else has happened but now I associate it with bad food. So I won't ever go there anymore except for a shake.