I really like duo and 4-man parties. Larger groups tend to be messy, because i only see just a few monsters you have to kill before you move on to the next group. Do you really need 15 men to do that? It's also a matter of content, there has not really been a reason to go play with 50 guys. When i started i imagined the limit was endless, but when i started paying attention there really isn't a reason to do 128. I hope it will come though because i want to see some of the massive in mmo's, and besides doing a mission or event with all of the linkshell sound pretty good to me.