Regarding abuse: in classic there were no self heal skills (I guess skills will be the same as in the past) like atm in retail in which everyone can mostly self sustain themselves and complaints about clerics have almost completely disappeared.
And yes, in early Aion days people were often blaming clerics for everything: dying, not dispelling in time, not healing enough or not on time, bad mana management, for having bad gear, wrong manastones, being lazy, stupid, not knowing the game, ... (insert whatever you want) and even their dog dying. And clerics retaliated by not healing particular players at all, which wasn't a bad solution, especially for those who were like 30 meters away or behind a wall or rock and were complaining nonstop about dying or those who didn't understand sometimes you have to keep alive the tank to avoid wipe and others are of lesser priority.
So, you will have to disregard such remarks and if you know it's not your fault don't even bother explaining. If you are too sensitive about people blaming you for no reason, then maybe consider another class.
For more info about gear you can maybe try do a google search for some old private webpages, some years ago I still stumbled upon some "outdated" websites (since old forums are gone).