I agree. Tonight I won a match that I was loosing because my opponent lost his connection. Those points were a little to easy to get. After the match I had ten points more than I deserved and therefore my ranking got higher than my performance was worth.
But on the other hand it´s just a game, so maybe we should not take ranking and points so seriously. I don´t know, but on the other hand even that it´s just a funny game, you still wan´t it to be a fair game.
A thing that you could argue is a little unfair is that if you play a very tight and good game against a far higher ranked player but loose for example 8-6 after a good performance, you get minus points. But if you play very badly and win for example 6-4 against a very low ranked player you get plus points. But maybe the performance was much better against the higher ranked player than against the lower ranked player.
But I guess it´s impossible to make a totally fair system. We have to live with that, I think. But if you are obsessed with your ranking, sometimes it´s just better to play against a much lower ranked player than to play against somebody who is much higher ranked. Every time I play against somebody with a ranking around 200-300 points I losse 5-10 points, so if I was obsessed with ranking then I would say: Ok, I refuse to play against Mr Perfect Curler with 500 points, but I would like to play against Mr Newbie with 4 points - because for my ranking that´s much better, since I have much much bigger chance of winning against the guy with 4 points.
For example the last time I played against a Top 3 Player on this site I lost 13-5! And lost a lot of points. But when I met a newbie and won 13-1 my ranking improved with 13-14 points. I don´t know if that is fair, because in my opinion I almost played better in the game that I lost 13-5. But I just met a guy who had played 1500 games and hardly missed any stone during the match (I have played 150), so it was mission impossible.
I have also noticed that the higher your ranking is, the less likely are the low ranked players to accept your challenges to play them, because if you have like 70-80 points, the ones with 0-10 points very often don´t wan´t to play against you. But on the other hand you will get more possibilties to play against high ranked players, who often don´t wan´t to "Waste their time" by playing against newbies with zero points. I believe that it must be boring for a guy with 500 ranking points to win 30-1 against a newbie.