I've seen more self hate from Assassins than hate from PUGs.
I've been in groups where we had 3 assassins. I was the only monk in the group, and we had a Necro and a Ranger.
Now this scenario just screams out "typical assassin" but what can you do with no Warriors.
So they tanked the best they could and I healed them as best I could. One pet and then the minions started to come out. It wasn't until about middle of the mission when the Assassins started to die (we were still on the Island). All of a sudden, one Assassin said he was dying too much and he was slowing the team down. I told him not to worry, we are almost done the mission. Just stay. The rest of the group agreed, he should stay. We had two fights left, and the Assassin left.
The other two, at least one with 60%dp and the other one was probably around 35%. None of them had any teleporting skills.
Anyway, we completed the mission with 2 swords. Admittedly, I'm not a good healer, but only the assassins died.
The further you go into the game, the better your chances are to getting into a group. You'll show your LV20, and they ask if you have any teleport skills. Just say yes (equip 1) and usually your in. Of course, don't expect to enter a group with 6 or more people.