We all know why - he's excellent on defense but hasn't shown any flair in attack.
This is a very important point, we dont need 15 players who have attacking flair, we only really need one at a minimum and 14 who are awesome at defence.
"running" attractive rugby is nice to watch but this is the world cup, and winning the trophy 3-0 will do me just fine.
I think before anyone is critisized for lack of attacking ability you need to look at their defensive performances. If you look at a guy like a fit A Fainga'a, I doubt he will ever score a hat trick against a top tier team, but he will certainly stop a hat trick being scored through his chanel. This is why QC (Quade Cooper) is hidden, if we leave no gaps where opponants can score then we have done half the job. We then only need to score 1 more point than what we concede.
I for one am not a McCabe fan, but do see his value to the team and would have gladly kept him in for the good of the team. Sometimes as a fan you have to swallow your pride and admit that some players you dont like are the best option for the team.