prop
do rating show how good you are
From a simple and commonly understood point of view, it can possibly but, it depends on how you got it. It depends on whether you have arrived at your first lenghty plateau stay, until you show remarkable improvement. Until then, you'll drift a bit in the rating pool.
...and then if you want to get technical about how accurate ratings are to begin with and the limitations of them, read these two articles over and over until you think you understand them and then we can discuss it...
http://www.cse.buffalo.edu/~regan/papers/pdf/ReHa11c.pdf
http://en.chessbase.com/news/2006/world_champions2006.pdf
Pay particular attention to the second article, for how they established the difficulty of each move. Make sure to read the first article, before you read the second.
Read at your own risk... Warning, not responsible for exploding heads...
It depends on how many you have played, and how hard you are actually trying. I come on here a lot and just rush, don't take my time. Goof off on Youtube, and I make a lot of blunders. My peak rating was in the high 1300's just a month or so ago. Now it's about 100 points lower.
I did not become worse in that amount of time, I'm just rushing more.
I just won my last game against somebody rated 100 points higher than me.
Also, you gain or lose a lot of points when you first join. After maybe 20 games or so it stabilizes.
no!!!!!!