There are as many bad managers as there are bad employees, and the failure of many new hires is directly attributable to the sloppy way that they were brought into the organization in the first place.
It is really important to develop a timetable for introducing new employees to the organization…. and sticking to it religiously. Many people have said to me that this kind of onboarding is only necessary in big companies that have lots of employees, but I strongly disagree. If you have 10 employees and are hiring somebody, then that person represents 10% of your pre-existing workforce.
If you were making an investment of that size in anything else you would do considerably more background checking it and spend whatever resources you felt were necessary to make sure that you were getting the most value out of that piece of equipment. This is no different, and developing sticking to an onboarding plan is an essential component of any successful hiring process.