I was a WHM first, SMN second and now PLD. Being a PLD after being a WHM is an eye opener. I now see both sides of the equation. Yeah I sometimes have problems holding aggro, especially when a lot is going on. But one time in WP, I had a super aggressive healer who always went ahead, used holy and aero too much, sometimes before I even got full aggro. I feel like parties don't work together like they should. Another healer in WP always used Medica II all the time. Had a terrible time keeping her from getting mobbed, sometimes she'd lead in with Medica II. Finally I told her I was a WHM first and that it's better to use targeted cures and regen as appropriate and Medica II only when absolutely necessary. Don't think she was using Shroud Of Saints either. But I was very polite about it, not mean or critical. The wiping stopped.
When I first started tanking, a WHM who was a tank first gave me advice in 1000 Maws. She called me aside and suggested some things. She said she didn't want to offend me. I told her no way she could, good advice and she was nice.
One thing in this game that bugs me is some ppl just through a fit when there are problems, order ppl and yell at ppl what they should do and can't be civil. I listen and learn a lot better when everyone is cool. And I treat others the same.
Some ppl just don't have any patience and it makes things worse. Parties are about working together, not beating ppl down if they are having problems.
