My experience is the network typically fails, but it can sometimes work.
Remember with networking there is often only one person in your network of hundreds who can do anything so you need to find that person. Often it will be the guy you just barely talked to who won't think of you at all unless you remind them, but they then know enough to know you are good enough for some position and then they are not interviewing they are convincing you to take the job.
Those cases where the network ensures you are the only candidate are one of the reasons why they work well. My current company doesn't work that way, it doesn't matter how good you are, all I can do is put your resume in the HR stack (unless it is for my department in which case my boss might ask me about a couple resumes). I'd be considered a conflict of interest so I couldn't interview you.
Remember with networking there is often only one person in your network of hundreds who can do anything so you need to find that person. Often it will be the guy you just barely talked to who won't think of you at all unless you remind them, but they then know enough to know you are good enough for some position and then they are not interviewing they are convincing you to take the job.
Those cases where the network ensures you are the only candidate are one of the reasons why they work well. My current company doesn't work that way, it doesn't matter how good you are, all I can do is put your resume in the HR stack (unless it is for my department in which case my boss might ask me about a couple resumes). I'd be considered a conflict of interest so I couldn't interview you.