I must have missed that part because I only saw him play a handful of games over a couple of years between injuries, showing glimpses of promise from time to time without really making the position his own.
McCabe granted. Considering nobody has shone at 13 outside him, one could argue he offers limited attacking ability. Fainga'a on the otherhand... Did you happen to see the past 2 seasons of the Reds. Fainga'a was a functional member of the most exciting attacking backline in Super Rugby. While he may not be a second playmaker, obviously between the form of Will Chambers outside of him in 2010 and the wingers outside of him in 2011, he is able to play a role in a well performing attacking backline that did not limit the attacking potential of those outside of him. To refer to him as merely a crash and bash merchant is both unfair, incorrect and ill informed.