Year of 4E!

I love the 4th Edition of Dungeons & Dragons. Not everyone agreed with the direction change, and a lot of people still think it was a mistake. But that edition brought me back to not only the DM’s chair but the designer’s seat. As the years go by I find more people who appreciate it and this year I want to look back. What worked? What failed? What was something that just didn’t connect with the audience? What lessons were learned and can still be learned?