I ran my 2nd parkrun yesterday and somehow ran 1min 28 secs faster than my first attempt so I'm very pleased. However I have to say that I think it's fab that parkrun send you an email with a general breakdown of your performance. I am not in competition with anyone but myself but on the other hand it is good to have a rough idea how you compare to others in your age category etc.
On a slightly disappointing note, there is regularly over 400 runners at my parkrun (scary) and I am the only one who has registered their running club as NHSC25K!