The great thing about Chess is that "suck" is a relative term. I haven't lost a game on chess.com against a 1700 yet, and I doubt I ever will.
However, I do find that my blitz rating fluctuates wildly, and I can go up and down by 100 points in a week. (Around a median of 950 - 1000) For me, there are two things that tend to drive it down. One is lack of sleep. If I don't get enough sleep, the blitz performance suffers greatly. The other is that there are times when I'm really working on my game,and I tend to think more about every move, and end up losing under time pressure, either on time, or being checkmated after a major blunder caused by a hasty move. I don't know if those experiences are common at twice my rating, but I suspect they are.
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