I don't know what you mean by "worst rated". A number of reviews have been published that indicate the manufacturer speed ratings (eg. Lexars 4X, 12X, 16X) are meaningless. Also, the write performance depends as much or more on the capabilities of device as on the controller on the card.
As far as I can tell, the CompUSA CF cards are rebadged Lexar 4X USB-enabled media. If you don't like them, don't buy them.