I'm sure your right, but I wouldn't say the HID's in a normal headlight are 'largely useless' as they are a fantastic improvement over stock lights.
Rob - I think what UncleFester was meaning was that full beams seem/are rubbish when you've got HIDs as your dipped beams (UncleFester - please correct me if I'm wrong?)
I don't think he's doubting that HIDs are a big improvement over stock, but by the sound of things they can be improved further.