Perma-newb syndrome
A syndrome where someone who, although experienced, will never become good at a game. They may play for a long time and get a few good rounds here and there, but for the most part, no matter how hard they try, they will never surpass newb level.
"Dude, you are horrible at this game. How long have you been playing?"
"A long time. I suffer from perma-newb syndrome"
"A long time. I suffer from perma-newb syndrome"