Both of mine are from PetSmart (I work there). A lot of the time our beardies are not handled, at least at my store, so they become shy. One of my boys was starving because the staff in charge of the pets couldn't get him to eat. He was so aggressive towards anyone who tried to hand feed him, and he refused to hunt. I decided to get him, and he was severely underweight and extremely aggressive. It took about a month but he's a good weight, very easy to handle, and loves attention now 4 months later.
My other boy had early signs of MBD, but he was handled more since he was being treated for it while he was in the store. We also got a new staff member since I got my first boy that pays special attention to the reptiles. He's been very friendly and easy to handle since about the 4th day or so after he settled in his tank.