"poor integration" is correct and usable in written English.
You can use it to describe a situation where different elements of something do not work well together. For example, "The poor integration of their software caused a number of errors in our system."
He also attributed the company's problems to poor integration of the more than two dozen smaller acquisitions it had made.
Poor integration of neocartilage with recipient has been a major obstacle to articular cartilage restoration.
With few exceptions, the poor integration of Africa's financial structures in the global financial system appears to have shielded the continent against the shock.
It attributed the restatement to control issues that "were the result of the company's extensive global presence, a highly decentralized structure and poor integration of past acquisitions".
He, too, blames poor integration and lack of capacity in NHS and GPs' out-of-hours services, in mental health teams and social services departments.
These weaknesses are typically characterized by the poor integration of knowledge from mental health experts, children's interests and designers' expertise.
However, these devices cannot mimic the biological teeth, do not remodel and they have poor integration with the host.
The task falls to "overseas visitor officers", who cannot easily impose decisions on senior staff.A further weakness is the poor integration between primary (local) and hospital services.
A major obstacle in the deployment of renewable energy beyond 30 per cent of the grid power is the poor integration of current electricity grids.
In the past, it is true, legitimate debates about cultural and religious tensions arising from the poor integration of ethnic minorities were often stifled by an excess of liberal zeal.
In fact there is some evidence that the poor integration of regulatory system components has led to adverse safety outcomes in some contexts.
