2010 was really bad too. I know two women who got pregnant there last year (2012) but I had two failed cycles (one failed, one ectopic) and one cancelled.
I can't point to anything they did wrong except the wrong protocol in the first cycle, but I also find it hard to justify the disparity in the stats between other clinics and GW.
The numbers are small, but the last time that went in their favor was 2009 stats, which were on a par with Shady Grove's. With small numbers, the variables in your patient population can skew the stats, though you'd think they would skew in favor of them sometimes, and not just one year (2009)