After playing several hundred games and watching at least that many, bad calls and bad refereeing even out. You need to be concerned about the 11 guys you're playing against, not the guy in the striped shirt. I have yet to see a ref kick a ball during a game, score or make a save. Getting on these boards whining about refs says more about you than about the refs.
I reffed a couple of summers when I was younger and I am looking forward to doing it after college. I think it actually helps my playing. A large part of the problem is that many of the refs in recreation, high school and even select never played soccer. Many of the guys are overweight and immobile. Whatever the quality of ref, I think the vast majority of these guys only want to do a good job and rarely are biased against a team. However, if you or your coach start getting in their faces, it's only human nature to react.