It's hard to disagree with much of the content of that post, to be honest. Second Life's retention rate - around 10% - stinks. Further, the retention rate hasn't changed in a year.

Second Life isn't getting better at the things it needs to improve, and the most-frequently-trafficked locations on the grid are still the free money islands and the free sex rooms. Sure, there's a lot of interesting and creative things being done on the grid, but those rarities are overwhelmed by the junk.