Usually that blurb is pretty general though. It should be about the specific car/loco being modeled (or at least one of the cars/locos, if the manufacturer offers multiple road numbers). I've seen some blurbs for foobies lately that are just pure marketing shine-ola. Atlas, at least, marks their loco paint schemes as being right, but for another phase of a loco and other such honesties. They're a cut above the rest though.
Manufacturers should also post photos that are of a quality that you can actually read the data markings, so you can be informed about how well they did. I for one would love to be able to read the build dates without taking my reading glasses (or a magnifying glass these days) to the LHS. I know some might say that if I can't read it with my regular glasses, why should I care. But I do, that's just the way it is.