How 'bout just "Disappointed in Camlocks?"
It's legitimate that you expected the ID of the barbed camlocks to be larger. I'm assuming you didn't really expected them to be 1/2", but to be more like what you'd see in a regular, $3 brass hose barb that you'd buy at Depot or Lowe's.
You *should* have done a little more research before buying them, but alas.
Still, I don't buy that Bargain Fittings has any obligation to disclose anything else. We know that a 1/2" hose barb has an ID < 1/2". That's a given. I'll grant you that it would be IDEAL that BF (and every other reseller) disclosed the specific ID of those barbs, but then we'd be expecting that on everything they sell. It would be ideal, but I don't see that BF has done anything wrong.
Putting them in the title, though, implies that they did, when in fact your only real complain (IMHO) should be with the manufacturer of the Camlocks. Just putting their name in the title effectively disparages a reputable vendor unfairly.