Red Shack is hard to categorize. Apparently there was, at one time, something red and shack-like from which it got its name. But now it's in a store front in what I'm told is Dogtown. Or possibly Maplewood. At any rate, the establishment is bare bones but not unpleasant.
I got enchiladas. The sauce you see covering them is basically smoke in sauce form. The rice and beans are not super flavorful, but decent. My dining companion said his tacos were very good.
If you're in the neighborhood, this is fine place for quick-and-dirty Mexican, but I wouldn't go out of my way.