Re: First Cousin Marriges...
Nope, not much of a problem usually, unless you have certain strong genes.
However, it depends. Is the cousin marriage one of the few cousin marriages in the family, or are most of the marriages done within the family? Big difference. Give it a few generations, and yeah, you will see defects. My daada remarried after his first wife died. He married his cousin --> of 6 kids, 2 were mentally retarded (serious), 2 were academically very behind compared to their peers, and the other 2 were ok (although one of those has a terrible temper and is now suffering from breast cancer and the other one is a flat out trouble maker, although that's a personality issue).
There have been other instances in my family, and so lately the marriages in our family have been with outsiders.
It really depends on the law of your land (I understand Islam permits you to marry your cousin, but your Islam also tells you to be a law-abiding citizen and follow the law of the land if you're living in a non-muslim country), and it depends on your family history of illnesses and your comfort level.