I was attracted to the headline of this thread because I have just had my own very eagerly awaited DNA results back and am feeling an awful sense of anti-climax. If it wasn't for the fact that I personally know my top two matches, I'd be tempted to think they'd got the kit boxes mixed up!
I know it's early days yet, but I haven't been able to find a single surname that matches to my father's side of the family amongst the long lists of 'cousins'. But what concerns me more is that I haven't been matched with someone whom I know is a fourth cousin of mine, and neither am I matched to any of the other people in that line that she has been matched with. Fortunately for me, I have a cousin in law who is much better versed and experienced in this field than I am (it wouldn't be hard!) and she is holding my virtual hand and helping me through it, but unless I find a match soon, I'm going to be worrying about a suspected extra marital event!
I take the point made earlier, that it is more helpful if you come from a more mixed ancestry. Mine has come back 96 per cent British Isles with a smidgeon of Western Europe, which doesn't apparently help.