Always make it about yourself. "Hey guys I know I'm terrible but I'm at least much better now that I optimized my character using askmrrobot.com. Yes sir, it really helped.". (I'm not terrible, at least not compared to some.)
So far in SoO LFR though, it's not DPS that's the problem, it's the lack of ability to do any kind of mechanic. People read that damned "I afk'd" article and decided to try it - hey! Maybe that's it - maybe Blizzard read that article and decided to make sure no fight could be survived while afk.