I've had this before, I can go from, "great healing, keep it up." to "WHAT DO YOU CALL THAT!!! I CAN HEAL BETTER WITH MY SCRAPPER!!" ect, ect.
Unfortunately, as War_Hero pointed out, these players do manage, somehow, to make it into the later levels. Fortunately, the 40+ heroes seem to apretiate that if an AV wants to take you out in one shot, no amount of blaming the Defender can change it, get a rez/awaken and get back to the pounding. Time and time again however, the people who comment, within minuites of making the comment make a mistake themselves.
[ QUOTE ]
I've had this before, I can go from, "great healing, keep it up." to "WHAT DO YOU CALL THAT!!! I CAN HEAL BETTER WITH MY SCRAPPER!!" ect, ect.
[/ QUOTE ]
Stick to teaming with the Seekers then Kid, you know we'll only spam you with abuse if you fail to "perform" in your "other duties" 
It seems that most defenders (& in some cases Controllers)can be pretty tough to play.
You can heal for an hour solidly, dutifully buffing your team, but then one wrong button or mis-timed buff etc. and you miss a person's heal/CM and you get "bloody useless defender!" shouted out?!?! I'll explain nicely at first and go from there.
Thankfully, this is primarily from the naive fools that haven't played the AT or people in the lower levels, but sometimes, just sometimes, these people creep into the higher levels having still not learnt!
"Like War_Hero said, leave it as it is, it toughens up the softies." - Naz Nomad
Union Heroes
War Borg - Leader of The Paragon Knights
Union Villains
McCabe - Co-leader of The Rogue Knights
Defiant - Supreme Hero