Got my week 23 factory 88 iPhone 4 on 23rd June, and still have it. 😉
That doesn't mean my phone is "perfect", but I'm not a picky person. Nonetheless, you should return/exchange your phone if you're not satisfied since you'll be sticking with it everyday until your next upgrade.
Here's what my phone has:
No to rattle when shaken.
No to yellow blob/spot on screen.
No to dead/stuck pixels on screen.
Yes to green/blue blob on pics in fluorescent lighting.
Yes to reception/bar drop when deathgripped (very slight, not a big prob).
Yes to proximity sensor problem (when in brighter areas).
-C
Sent from my iPhone 4