I don't think he needs to be reported to be honest. Things like personal attacks that are way uncalled for would be a better reason to report someone (threats, harassment, that sort of thing.)
Point is, it's in his best interest to let this thread die. No matter how good of a player people thought he was in previous games, this thread alone will likely label him as an incompetent whiner that's unable to adapt to a changing game.
Just let it die already.