The rating system here at Chess.com take into account the uncertainty of your and your opponents rating, when calculating the amount of points that you earn. You will find that as you play more games, your rating will also become more stable.

The system is build on statestics and I believe it is very fair.

therobz : You maybe right, but if i'll start game with opponent that have 1500 rating and he lose other game during our, then i will get points for 900 rated player and not for 1500... 

If you are good at maths, look at the formula. If you are not good at maths, I wounldn't worry about it.

Aren't you the guy who posts "easy" on all the tactical trainer problems?  Very annoying.

I actually think the ratings system does need to be adjusted slightly.  The RD should be altered to suit the type of Chess we are playing, rather than trying to mimic OTB play.

That's true.

Play enough games and there will be an equal number of games where the reverse is true. Your opponents having a higher rating than at the start.