I am glad you are not giving up. I found the ritualist to be the most fun class for me to play after trying all of them.
I used to Ritual Lord for Urgoz's Warren and for some guilty pleasure at THK. I have to admit that after the nerf its hard to get my rit into any of the elite areas now except perhaps as a restorationalist. The ritual lord build wasnt overpowered for the elite missions although it was for everything else.
The problem with the ritualist is the synergy issue. A pair of ritualists are extremely powerful together if they play off each other's skills. A ritualist can synergize with the other classes but to a lesser extent. They can also interfere with those classes as well, however. I try my best to be careful when a ranger has spirits down or there is an MM in the team.
I have to admit that I did wipe out many a minion army or ranger build thanks to my lack of understanding of the rit when I was new to the class. I now try to help new rits avoid some of the mistakes I made

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As a ritualist, I have been requested to play with spirits and even had the team wait until they were up before the enemies were pulled to the spirit line. I have also been requested to hold areas in certain missions alone while the team finished a bonus or other objective. So there is hope out there for pugs and ritualists.