I do enjoy the Mabar event when it comes around. The main problem for me is when you finally get to fight the dragon, often the lag monster gets you. It appears if you're in one of the first groups to make it in the instance your experience is virtually lag free. The other groups starts to experience the lag when the fighting begins and it lasts until they lose and are ejected or other groups start to kill dragons and are no longer fighting in instances.
The solution seems to be avoiding having everyone fighting the dragon at the same time. A way to accomplish this is to have first tier instances fight the dragon after waiting 5 minutes, second tier instances waits 10 minutes, they could use the extra time for the group to fill anyway. This will at least split the amount of action happening at once in half.