I read somewhere that Giant (a Taiwanese company, by the way) is the largest manufacturer of carbon fiber bicycle frames in the world. Nobody else is even close. I know they make frames for a multitude of American bicycle companies although I don't know which ones. I think the right answer was the one above that explained these frames could very well be made by Giant but have designs and geometries specified by the American bicycle company. So they wouldn't all be the same even though many of them came from the same manufacturer.
I saw a Giant OCR Comp 1 at the bike shop the other day and it is an impressive bike. Beautiful CF frame. Very nice machine. I don't need one since I already have a CF bike but I sure would be happy to ride one of those. I see nothing wrong with it at all and I certainly see no reason to denigrate it. No kidding, it's an impressive bike. Personally, I would probably buy it at it's price before a comparably equipped Trek or Specialized at their prices.