GPA is important, and from my research and understanding LSAT scores even more important. Look at it this way, most colleges probably have one student each year graduate with a 4.0. So may have two or three, but arguendo, say 1. There are close to 3,000 colleges (4 year programs). So 3,000 people with 4.0.
Now there are roughly 100,000 people who take the LSAT every year. 179 and 180 typically are both at the 99.9 percentile, meaning approxiamtely 100 students each year will score those scores. So the LSAT is more exclusive with its socring.
As for having more than one degree, if it comes down to two identical people in every aspect except one has an additional degree, assume the person with two degrees wins the tie breaker.