Starting with GMAT's Reading Comprehension (RC), I finished with 65% right of the first block. Such a low score doesn't make me happy either (and actually looks like a pretty sad tendency :).
However, I found a pretty interesting thing - I tend to make a lot of errors while reading text about animals and insects, but everything else, which is related to history, business or social is never less then 85-90% of correct answers.
While low scores are pretty depressing, I'm very sure that keeping up the good plan and working hard could give me the target 700+ score on the exam. It's sad that I don't really remember my feelings and thoughts when I just started to prepare for PMP exam, but I guess it wasn't that much fun either. It took me a fair amount of time to get on track, but I ended up with a pretty high scores on the exam (I guess I screwed up only one category getting moderate proficiency on it, while getting the tops on all others).