Return back the D7000 due to AF problem.

the d7000 I got from amazon, has problem AF when object move, at a park when I shoot picture of ducks, nearly all shots when out of focus, with GH1 i had almost no burry shot, lens use was the 50mm 1.8 and 18-200mm vr, manual is fine but af just can't keep up even though when i burst with high speed 6fps. also the lens produce sometime too unnature color at portrail shot. Camera does take great sharp picture but af problem just can't keep to keep this camera. Also the auto iso are not accurate a lot of time when using the build in camera flash, it often over exposed.