Part of the problem is that the FTC is only so big, with only so many people, and the entire market is huge. I agree that even the allowable claims are suspect, but there are limits, even if they're not always enforced.
I don't know the examples you are talking about, but yea, in an ideal world I'd fine the crap out of "super food" companies. The problem is that they tend to have copywriters talented enough to phrase things in such a way that it is just barely not a totally obvious lie.
Also: "low fat" or "low sugar" products that normally don't contain much fat or sugar to begin with. Like "low fat" ice cream that compensates the reduced fat with more sugar (d'oh).
Yeah, that sounds like a recipe for failure... You can eat low fat ice-cream and low-sugar cake and end up eating more fat and sugar than you would get from regular ice cream and cake.