I am a local, but I planned my friend's bachelorette here this past weekend. The only bad part of the experience was checking in. We had 8 girls and two rooms. Only one room was ready around 430 (check-in is at 3pm). The other room wasn't ready until 530 and we all had to get ready for dinner. That was really disappointing from a Wynn resort.
Apart from that - service the entire stay was unbelievable. Everyone was so friendly. The dealers at the craps and blackjack tables were so funny and pleasant. Room service was OK, and the pool was a great experience (very low-key with great drinks).
Whenever my family visits, I know where to send them.