I suggest instead of the all powerful randomly chosen leader who often enough rules with an iron fist, we go for more of a vote based system.
A good example of why this would be better, Upon joining a random group and going down a few floors I decide to crack open an energy cost gate for everyone, I made sure that I let the people know and the other person in the party, notably not the leader is waiting with me on the team button while we try and get the leader to get his butt over there instead he sits on the lift, and kicks us both leaving us party-less and being that i was lovingly sitting on the button, I have a lag attack as I'm flung into a new instance, and besieged by a group of monsters and having no recourse to leave I try and fight them back, I die but revive figuring I should be able to handle it now that my lag attack is gone and I'll be at full health, I died again this time choosing to go to haven, but before going to haven i've already wasted a total of 23 energy counting the gate, all for the love of an idiot who doesn't understand how to take advantage of random kindness, and a few floors above we had someone who wasn't killing anything and just sitting back collecting loot, and the leader wouldn't kick him, the mooch only left when he ran out of energy.
Vote based kicks would appease players better due to having more control over the situation, and if you want to invite your friends, there's still the private invite system which is totally workable, so why is it all thrown onto a leader chosen on a random basis, who has a good chance of being a total moron?
For those who didn't bother to read my rant, vote based kick system = more happy people.