This discussion always seems to be cut in half, its either "Oh god no, and Area 51 DLC would svck." or "Oh cool more aliens in test-tubes and experimental technology." Maybe not that exactly but it always seems to be this way, and yah I think it would have been better to have some more real life places in NV.
I'm less on the side of saying that it would svck, more on the side of saying there is no reason to believe Area 51 is an interesting location. But there are tons of real life places in New Vegas. Goodsprings, Primm, Nipton, Nellis, Mt. Charleston, Cottonwood Cove, etc. That certainly isn't all of them, just like Fallout 3, it is modeled after the actual area and though the map is not to scale, the real life locations are where they should be.