I ran a Level 24 weekly strike with some guy a couple of weeks ago (when it was Phogoth and my Warlock was fresh with no gear) and he was absolutely terrible. We did the Shrieker room strategy, but he kept killing the shrieker every time it spawned. I finally had to message him to tell him to stop because it was making it impossible to put damage into Phogoth with all the wizards he was spawning. After that, he has been messaging me for weeks about me doing raids with him and wanting me to carry him. He's still level 27 last I checked...finally got so annoyed with him I had to block him via Xbox Live.