@ The original poster: Dude, that sucks. I can honestly say I have never had any of the troubles you speak of. At the most, the team rit's will discuss spirit management to avoid clashes. That's it. As others have suggested, if you get in a group that bitches, screw em'. Just leave. They are probably gonna' cause more problems than that in the mission anyway. Besides; why put up with abuse from the infantile portion of the community? I have hope that they don't make up the average 

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Ok. Since when has any class been 'your'(hypothetical, for those with issues _-_) personal maid? Most of this thread has been full of ignorance about the ritualist class, and a few complaining about the lack of free arse-wiping. After you have played as one, you may (hopefully) understand that a class with healing spells may not necessarily amount to healers.
Ritualists have many uses... 
A spell that ignores armour and DOES'NT give you exhaustion? Check. 
A myriad of armour ignoring artillery? Check. 
A class that can disenchant? Check.
A class that can interrupt? Check.
A class that can blind? Check.
A class that can res multiple members of the team in one shot? Even the damn casting Ritualist if he or she dies? Check.
A class that can also heal some what? (Get it. 'Some' what). Check.
There is so much. Try it out. You might be surprised.