9 times out of 10 the manager will give me the flag and tell me to approach a huddled group of men, one of whom will do it after peer pressure from the others. These guys are honest and relatively useful.
1 time out of 10 the manager will point me to either an assistant coach or a parent warming up/training the goalkeeper. It is then that I am wary as these guys tend to be overly competitive which tends to be when any cheating occurs.
For the most part they are useful for me at least, I can't imagine having to call offsides myself. It's when they take it upon themselves to call fouls that I find them annoying.