I'm scoring 50-60% success rate on my AAMC old exams. Horrible? Decent? Good?

I am taking the MCAT in April and I have most of the old AAMC MCAT practice tests (tests 3-11) and old KAPLAN FL's (from 2003). I am scoring at a pretty consistent rate of 50-60% correct rate, and when I review my answers I tend to find boneheaded reasoning in 1 or 2 questions per passage. After I overview the concept that I missed it does make me feel stronger in that area. How does this diagnostic feel from an outside perspective?

By the way, I have only taken 1 AAMC and 1 KAPLAN.