My first Marathon and thouroughly enjoyed it. Registration to the start was easy and good fun. The race itself was amazing, but hot. I was amazed by the support there was all the way around the course. Even at the more industrial points on the run, of which I had heard horror stories, there was still support. I even got a high 5 from Fat Boy Slim at around 23 miles which was much needed after a bout of cramp.
The only criticism would be the end. It was far too crowded and there was not enough room for people to move around. I actually thought it was dangerous. A few more road crossings or bridges are needed.
Having said that that should not take anything away from a great event that had a great atmosphere.