We call It Soccer has a concise review of Franklin Foer’s book How Soccer Explains the World. They find the main thesis of the book weak and unconvincing but it might be worth picking up by serious soccer fans for the "cool anectdotes about players and fans and clubs" from all over. They’re also spot on about the gap that soccer has to overcome to be more popular in the US:
The kids know it. People our age and older don’t. It’s not necessarily a cultural gap. It’s an exposure gap.