Anything that was in my control is done right and works perfectly. Anything not under my control was iffy.
The manager's dilemma and the art of delegation
But a real and serious issue nonetheless.
In a professional work situation the solution is to have well-trained staff with a good work ethic and appropriate systems of work, however it is very different when engaging a contractor to undertake work for you, especially, but not only, in a matter about which you have little or no clear understanding. It is very difficult to determine which tradesman or firm will provide a truly honest, diligent and effective service. Personally I always do whatever I can myself, which has included all plumbing and electrical work in several houses, including full rewiring and complete plumbing, and many other things - primarily to save money, but also because I can ensure the most effective setup, and I know the quality of my work. But trades where I have less knowledge/ability or which is too large a scale in terms of time i.e. building construction, I have to entrust to contractors, and universally every one I have used has attempted to cut corners and/or done a less than perfect job, and other than standing over them, which I simply don't have time to do, it seems either I have no ability to find a good builder or thhey are so rare that it is simply pot luck as to whether one can be found, at least where I live. More recently electrical work has become more expensive because of the need to have tested and certified, not being a registered electrician, but that doesn't apply to computer networking, at least not where I am located - and it is simple enough for anyone to do, if they have the time and inclination, and do a little learning.