For me it's all about effort. A new player I can understand not quite grasping everything yet, but an honest effort is all I ask.

Don't just spam fire 3 and blizzard 3 and call it a day. Learn the basics of your job. AOE when appropriate. If you need help, ask for it. And don't take advice as a personal attack. (Unless someone is being a jerk about it but I generally find people are polite about such things at first.)

It's fine to make mistakes and learn from them. But what makes a REALLY bad player is being bad and being complacent about being bad. People that don't care they're being bad, make no effort to improve. LIke when I started DRKing, I was under the mistaken impression that darkside was something you toggled on to do damage then toggled off to regen mp, while in truth you should be keeping it on at all times and using your abilities to regen mp like your dps combo etc. I was doing something wrong, it was pointed out to me, I corrected myself and learned. I'm still not a great DRK but I got better.