Rather than come out with guns blazing, why don't you post a couple of images which you feel shows the deficiencies of the lenses? You don't say in what ways these two lenses are defective and posting images will allow us to see for ourselves.
Keep in mind, in addition to the lenses themselves, there are other factors to consider, including:
Appropriate shutter speed and aperture
Solid camera support/hand-holding technique
If shooting JPG, appropriate in-camera setting for sharpness
If shooting RAW, proper post-processing, including appropriate sharpening
The IS switch on the 70-200 can be easily moved inadvertantly to the "off" position, which will affect camera steadiness at low shutter speeds.
Additionally, it may be that your camera body's autofocusing mechanism is either front or rear focusing.
If the lenses are recently bought and you are within the time limit, you could return them to the merchant for exchange. If beyond the return limit, body and lenses can be repaired/calibrated by the manufacturer.
All that being said, I own both of these lenses and I am very pleased with the performance of both.