Thing is, GOMAD is about 2.5k calories by itself. The upper limit in terms of calorie needs of any person just starting (who will usually entertain the idea of GOMAD) would probably be around 6k calories.
If you need 6k, then GOMAD would be pretty reasonable. That would leave 3.5k in whole foods and such, which is a good bit. What doesn't make a lot of sense to me would be, say, someone doing GOMAD and only taking in 4k calories per day. Then, you're only talking about eating 1.5k calories of actual food.
That said, GOMAD has worked for some, and it will work for others later on. Give it a shot for a couple of weeks and see whether it's what you need.
So, how big are you? What are your goals? How many cals/day are you currently consuming?