I enjoyed it. It was something new and quite the challenge. I completed the 36-45 interval and for the lower levels in each interval the quest can be really hard.
Many people have had good points on alternatives for the "find x granite" part. I had to do 2 BN and 2 OF. More than that would been hard just on the resource needed to acquire those quest.
But in the end I really enjoyed it and want to see something similar again. It got the guild together helping each other finish it. I was also one of those few who enjoyed the End of the World event. These things make it all interesting and fun. Worth maybe mentioning that I dont buy gems so I did not have it easier to complete four winds or the EotW.