Overproduced is some kind of nebulous bullshit term that some music critics use to sound hip and informed. Anything that is lush and full is labeled as that... but it is what it IS... LUSH and FULL. There is a place for big and bombastic productions just as there is a place for more stripped down kind of things, and everything in between. It's just like food. you have hot dogs, then you have hamburgers, then you have steak, and sometimes people like to get fancy and make some veal prince orloff. Of course, the biggest example of what people call "Over produced" would be Richard Harris' Macarthur Park, which I think is the biggest masterpiece in pop music history. There is no such thing as overproduced in my book, the bigger the better... such as this: